Jackie ‘O’ Henderson shows off her trim pins in a mini skirt as she arrives at the Australian Grand Prix in Melbourne with her friend Gemma O’Neill

Jackie ‘O’ Henderson dressed to impress while watching the Australian Grand Prix in Melbourne with her friend Gemma O’Neill on Saturday.

The radio presenter, 49, showed off her stylish pins in a tiny beige skirt and white lace shirt as she arrived at the event with Gemma.

Jackie accessorized her elegant look with a pair of beige strappy heels and a designer bag.

She left her hair long and blonde and protected herself from the summer sun with dark sunglasses.

Jackie finished her ensemble with gold earrings and was all smiles when she arrived at the venue.

Over the past year, the radio host transformed her figure by losing an impressive 18kg.

She was recently forced to deny that Ozempic is behind her spectacular weight loss.

Ozempic, an appetite suppressant previously used to treat type II diabetes, has seen a rise in obesity prescriptions in recent years and is now used by many celebrities to maintain a slim figure.

Jackie has always insisted that she managed to lose weight by attending WW (Weight Watchers), for which she was an official ambassador.

Last month, she told Daily Mail Australia at Luke McLeod’s book launch for Everyday Enlightenment how she maintains her youthful appearance.

Jackie said being happy and positive has helped her look so young.

“I’m a smoker of everything and I haven’t really taken care of my body over the years,” she revealed.

‘But I have always been a very positive and generally happy person. To be honest, I couldn’t attribute (my youthful appearance) to anything else.’

She also revealed how meditation has helped her relieve a lot of stress over the years.

“I think meditation definitely takes you to a much calmer and joyful place in your life and that relieves a lot of stress,” Jackie said.

‘And as we know, stress is the number one factor in aging and health problems in general. That is why I firmly believe in meditation.”