Loved-up Naomi Campbell sets sail with her billionaire beau

The supermodel, dressed in a black string bikini, showered her beau with kisses and hugs as they soaked up the sun in St Tropez aboard his luxury yacht, Lady In Blue.

Love boat: Naomi Campbell and Vladislav Doronin in St Tropez yesterday

The pair's relationship has become increasingly serious after Naomi introduced Doronin to 12 of her most trusted friends at a dinner party in the South of France last month.

With an estimated £1.5billion fortune, the 46-year-old a property tycoon has a penchant for high-living and beautiful women that has earned him the nickname of Moscow’s Donald Trump.

Inseparable: The pair have barely left each other's side since crossing paths at the Cannes Film Festival in May

His property projects include Moscow City, a spectacular Canary Wharf-style development that is helping transform the once-poor city into a glamorous destination.

Naomi, 38, met him at the Cannes Film Festival in May, shortly after the outburst on a British Airways flight that led to her arrest, and they have been inseparable ever since.

One of Naomi’s guests, Brazilian writer Bruno Astuto, said: 'She said it was love at first sight and he is completely in love with her. Watching them look deeply into each other’s eyes, it was obvious that this is a very serious affair.

Lovers ahoy! Friends say it was 'love at first sight' for Naomi and the Russian billionaire

'He thinks she is a goddess and Naomi believes she finally has found the right man. She is now planning a really big party for Vlad, where we hope they will announce their engagement.'

The secretive oligarch - previously wrongly identified as Brazilian Marcus Elias - attended the recent London dinner for Nelson Mandela's 90th birthday, where Naomi was also a guest.

Naomi's tempestuous love life has also included a romance with motor-racing tycoon Flavio Briatore and one engagement, to U2 bassist Adam Clayton.

Hands on: Doronin helps Naomi dry off after a dip in the sea