Katharine McPhee, 37, and David Foster, 71, get out for the FIRST TIME with son Rennie

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Katharine McPhee and husband David Foster, 71, were first spotted on Thursday with their newborn son Rennie enjoying brunch in Beverly Hills.

The family dined outdoors at the chic Maybourne Hotel with a select group of friends to celebrate McPhee’s 37th birthday.

Katharine, who welcomed her first child with David in late February, looked like the doting mother in every way as she gently cradled Rennie in her arms at their designated dining table.

First Time: Katharine McPhee and husband David Foster, 71, were first seen on Thursday with their newborn son Rennie enjoying brunch in Beverly Hills

First Time: Katharine McPhee and husband David Foster, 71, were first seen on Thursday with their newborn son Rennie enjoying brunch in Beverly Hills

Loving Mother: Katharine, who welcomed her first child with David in late February, looked like the loving mother in every way as she tenderly cradled Rennie in her arms at their designated dining table

Loving Mother: Katharine, who welcomed her first child with David in late February, looked like the loving mother in every way as she tenderly cradled Rennie in her arms at their designated dining table

Loving Mother: Katharine, who welcomed her first child with David in late February, looked like the loving mother in every way as she tenderly cradled Rennie in her arms at their designated dining table

Katharine was clearly beaten and pressed her son’s head to her cheek before giving him a few kisses.

The tiny newborn looked sweet in a radiant white onesie and fluttered in his mother’s arms as she continued to pamper him.

Katharine and David were first seen when they arrived at the luxury establishment with Rennie safely stowed away in a padded baby carrier, which Katharine handled easily.

The waitress actress looked spring-ready in a colorful floral mini dress with a plunging neckline that allowed her to show off her smooth plunging neckline.

Sweet: Katharine was clearly spanked and pressed her son's head to her cheek before giving him a few kisses

Sweet: Katharine was clearly spanked and pressed her son's head to her cheek before giving him a few kisses

Sweet: Katharine was clearly spanked and pressed her son’s head to her cheek before giving him a few kisses

Motherhood: The little newborn looked sweet in a radiant white onesie and swung around in his mom's arms as she continued to pamper him

Motherhood: The little newborn looked sweet in a radiant white onesie and swung around in his mom's arms as she continued to pamper him

Motherhood: The little newborn looked sweet in a radiant white onesie and swung around in his mom's arms as she continued to pamper him

Motherhood: The little newborn looked sweet in a radiant white onesie and swung around in his mom's arms as she continued to pamper him

Motherhood: The little newborn looked sweet in a radiant white onesie and swung around in his mom’s arms as she continued to pamper him

Due to the windy weather, Katharine layered her ensemble with an ivory cable knit cardigan that hung just past her dress.

She had hung many gold chains around her neck and a few gold hoops in her ears.

McPhee’s dark brown hair was parted in the middle and styled into a chic low ponytail and had a natural red make-up look.

Flower power: the waitress actress looked ready for spring in a colorful mini dress with flowers and a plunging neckline that allowed her to show off her smooth plunging neckline

Flower power: the waitress actress looked ready for spring in a colorful mini dress with flowers and a plunging neckline that allowed her to show off her smooth plunging neckline

Flower power: the waitress actress looked ready for spring in a colorful mini dress with flowers and a plunging neckline that allowed her to show off her smooth plunging neckline

Breezy: Due to the windy weather, Katharine layered her ensemble with an ivory cable knit cardigan that hung just past her dress

Breezy: Due to the windy weather, Katharine layered her ensemble with an ivory cable knit cardigan that hung just past her dress

Breezy: Due to the windy weather, Katharine layered her ensemble with an ivory cable knit cardigan that hung just past her dress

While Katharine took over the baby carrier, David lugged their belongings around in a blue Givenchy tote that he carried in one hand.

The 71-year-old musician cut a stylish figure to celebrate his wife’s birthday in ripped jeans and a light blue button-down shirt.

Foster braved the unusually chilly SoCal weather in a navy blue jacket.

Golden girl: she had a large number of gold chains around her neck and a few gold rings in her ears

Golden girl: she had a large number of gold chains around her neck and a few gold rings in her ears

Golden girl: she had a large number of gold chains around her neck and a few gold rings in her ears

Kisses: To control her newborn, Katharine held him tightly to her chest and cradled his head in her groomed hands

Kisses: To control her newborn, Katharine held him tightly to her chest and cradled his head in her groomed hands

Kisses: To control her newborn, Katharine held him tightly to her chest and cradled his head in her groomed hands

After enjoying their delicious brunch with friends, the couple fled the establishment and made their way to their black SUV.

Rennie looked incredibly cozy in his baby carrier, while wrapped in a baby blanket with a white and gray pattern.

Under COVID-19 safety protocols, McPhee and Foster made sure to wear face masks.

Arrival: Katharine and David were first seen arriving at the luxury establishment with Rennie safely stowed in a padded baby carrier, which Katharine handled with ease

Arrival: Katharine and David were first seen arriving at the luxury establishment with Rennie safely stowed in a padded baby carrier, which Katharine handled with ease

Arrival: Katharine and David were first seen arriving at the luxury establishment with Rennie safely stowed in a padded baby carrier, which Katharine handled with ease

Time to Go: After enjoying their delicious brunch with friends, the married couple fled the establishment and made their way to their black SUV

Time to Go: After enjoying their delicious brunch with friends, the married couple fled the establishment and made their way to their black SUV

Time to Go: After enjoying their delicious brunch with friends, the married couple fled the establishment and made their way to their black SUV

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver’s seat.

Katharine’s representative announced the famous birth of Rennie in late February and told People, “Mom, dad, and son are doing great.”

Rennie is Katharine’s firstborn child, but David also has five daughters, four of whom are older than their current stepmother.

McPhee finally revealed her newborn son’s name as she appeared from a distance Today earlier this month.

Cozy Boy: Rennie looked incredibly cozy in his baby carrier, while wrapped in a white and gray baby blanket with a pattern

Cozy Boy: Rennie looked incredibly cozy in his baby carrier, while wrapped in a white and gray baby blanket with a pattern

Cozy Boy: Rennie looked incredibly cozy in his baby carrier, while wrapped in a white and gray baby blanket with a pattern

Safety first: Under COVID-19 safety protocols, McPhee and Foster made sure face masks were put on

Safety first: Under COVID-19 safety protocols, McPhee and Foster made sure face masks were put on

Safety first: Under COVID-19 safety protocols, McPhee and Foster made sure face masks were put on

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver's seat

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver's seat

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver's seat

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver's seat

Katharine effortlessly put their newborn baby in the backseat of the car, while David hopped in the driver’s seat

“My husband will probably kill me for saying so, but his name is Rennie David Foster,” she said.

She explained to the Today host that she and David “ had a few names [picked out], but my husband was on a text chain with his sisters and one of his sisters suggested an old family name. ‘

The Smash star continued: ‘It was his great grandfather’s name, his great uncle’s name, so it has a long history in his family.’

When the baby was born, “my husband said,” Hello, Ren Foster, “and so we said,” That’s a good name. It’s a strong name. ”

Arrival: Katharine's representative announced the famous announcement of Rennie's birth in late February, telling People, 'Mom, dad and son all make it great'

Arrival: Katharine's representative announced the famous announcement of Rennie's birth in late February, telling People, 'Mom, dad and son all make it great'

Arrival: Katharine’s representative announced the famous announcement of Rennie’s birth in late February, telling People, ‘Mom, dad and son all make it great’

Revealed: McPhee finally revealed her newborn son's name, appearing remotely on Today earlier this month

Revealed: McPhee finally revealed her newborn son's name, appearing remotely on Today earlier this month

Revealed: McPhee finally revealed her newborn son’s name, appearing remotely on Today earlier this month

Katharine was previously married to Nick Cokas, 55, but they broke up after kissing her dashing married Smash director Michael Morris.

She became involved with David in 2017 and they married two years later in London, where she starred in a West End production of Waitress.

Katharine had actually met David in 2006 when she was on American Idol and he was a guest mentor.

The Smash actress is David’s fifth wife – her most recent predecessor was Yolanda, the mother of Gigi and Bella Hadid, who was a real-life Beverly Hills housewife.

Married Life: Katharine is David's fifth wife - her most recent predecessor was Gigi and Bella Hadid's mother, Yolanda, who was a true Beverly Hills housewife;  David and Katharine pictured in 2019

Married Life: Katharine is David's fifth wife - her most recent predecessor was Gigi and Bella Hadid's mother, Yolanda, who was a true Beverly Hills housewife;  David and Katharine pictured in 2019

Married Life: Katharine is David’s fifth wife – her most recent predecessor was Gigi and Bella Hadid’s mother, Yolanda, who was a true Beverly Hills housewife; David and Katharine pictured in 2019