Paris Hilton’s brother Barron Hilton welcomes his third child, son Apollo, with wife Tessa Hilton

Paris Hilton’s younger brother Barron Hilton II has welcomed his third child.

The 34-year-old estate agent’s wife of five years, Tessa Gräfin von Walderdorff, announced on Sunday Instagram that their son Apollo Winter Hilton officially arrived on Friday.

The 30-year-old countess included a black-and-white photo of their newborn baby boy wearing a little beanie while they were swaddled in a cozy blanket.

Tessa received congratulatory comments from Barron’s other big sister Nicky Hilton, aunt Kyle Richards, cousin Farrah Brittany Aldjufrie, stylist Rachel Zoe and socialite Faye Resnick.

The Hiltons are already proud parents to four-year-old daughter Milou Alizée and 18-month-old son Caspian Barron Hilton.

‘We will be outnumbered! But I feel like once you do two, you can do three. You just get used to it,” Tessa said People November last year.

‘It’s hard now to imagine that even when it’s just Barron, Milou and myself on the beach and Caspian napping, we’re like, something’s missing. So it just keeps growing and it just keeps getting fuller. And the memories just keep getting better’.

The former Bernstein Equity Partners VP of Marketing originally met his lady love at a Saint Barthélemy restaurant Le Ti in January 2016.

Barron proposed to Tessa in Central Park in their native Manhattan just 20 months later.

The Hiltons and patriarch Rick Hilton are co-founders and co-CEOs of Hilton Hilton, a newly launched ‘unconventional global luxury real estate company’.

Real estate is far from the inseparable couple’s educational background.

Tessa double majored in written arts and French while attending Bard College in New York.

Barron graduated from Loyola Marymount University with a degree in Cinematography and Film/Video Production.