Naomi Campbell shows off timeless figure in bikini

Naomi Campbell relaxes on Miami Beach in a skimpy orange bikini

The couple are entwined as they take a golf cart back to their hotel

Naomi is looking as slim and taut as ever in her orange bikini

Naomi flew to Vladislav Doronin's side after modelling on the catwalk during various fashion weeks

Naomi looked relaxed and happy as she chatted on her mobile phone

She's eight months away from her 40th birthday, but Naomi Campbell's figure appears to be just as slim and taut as when she first started modelling.

After weeks of jetsetting from the U.S. to Europe for various fashion weeks, the supermodel was reunited with her Russian billionaire boyfriend Vladislav Doronin in Florida.

The 39-year-old couldn't wait to get in her orange bikini and soaked up the sun as she lazed around on Miami Beach.

Looking toned and healthy in the two-piece, Naomi sipped on cocktails and cuddled up to the 47-year-old on the sun loungers.

No doubt the couple are enjoying the warm Florida sun before they return to their luxury penthouse in Moscow, which is currently a chilly 7 degrees Celsius.

Surrounded by friends, the couple were inseparable and barely left each other's sides during their day at the beach.

They then returned on a golf cart to their $3,250-a-night ocean view suite at the nearby Setai South Beach hotel.

Despite looking confident and happy on the beach, Naomi recently admitted she worries about the appearance of her ageing body.

She said: 'I’m not immune to being insecure - especially as I’m getting older. But I love what I do so I have to put in a little more effort.