Reality star Tinsley Mortimer is a bikini beauty in Miami

She is said to be one of the most famous faces in New York. But all eyes were on Tinsley Mortimer's amazing figure yesterday in Miami, Florida. The Socialite fashion designer turned reality TV star was looking stunning in a stylish navy and white striped bikini with a gold frilled trim.

Reality TV star Tinsley Mortimer looked stunning as she enjoyed a day at the beach with her boyfriend, Brian Mozza, yesterday in Miami

Mortimer is a regular in the society papers of New York's newspapers and a darling of the club scene. She translated her infamy into a reality TV show, entitled High Society, which debuted in the U.S. last May.

In addition to her night clubbing and her TV show, Mortimer is a fashion designer with a range of handbags and clothing.

The 34-year-old is in amazing shape and clearly had no problem in showing off the results of all her hard work in the gym

Mortimer was wearing a Beach Bunny Swimwear bikini designed by Kourtney Kardashian

Mortimer looked as if she was having a great day as she sunbathed and frolicked in the surf with her hunky boyfriend, 26-year-old Brian Mazza. The couple couldn't keep their hands off of each other, hugging and kissing each other throughout the entire afternoon.

Mortimer's mega-cute bikini was from the Beach Bunny swimwear line which is designed by her fellow reality TV stars, the Kardashian sisters. She was rocking the 'walk in the water' bikini which is one of Kourtney Kardashian's creations. And style doesn't come cheap it seems. The bikini retails at around $199.00.

The couple were in town for a good reason - Mortimer hosted an event Friday night at SET nightclub on behalf of the Humane Society.

Mortimer and Mozza were clearly enjoying themselves as they

frolicked in the surf

Mortimer was happy to show off the results of her many hours spent

working out in the gym

Mortimer was clearly making the most of her time in the sunshine before heading back to her freezing cold home town. 'Another beautiful day in Miami!! Hanging at the Shore club beach then back to NYC tonight,' she Tweeted.

Mortimer and Mozza have been dating since April since meeting at a New York club. Mozza is a fixture on the club scene, working as Vice President　 of hospitality at the Paige Management Group who own exclusive restaurants The Ainsworth and The Hill. Mozza appeared in the first episode of Mortimer's reality show, though not as a love interest.

The self-professed 'nightlife player' told the New York Post: 'What started out as a reality show stunt has turned into a real relationship.

Mortimer and Mozza, who have been dating since April, could not keep their hands off each other

'We're having a good time going out to clubs and to dinners. But I don't want to get into anything personal.' Mortimer has previously been married twice - both times to the same person.

She married Robert Livingstone 'Topper' Mortimer, who she met when they were both students at the exclusive Lawrenceville school, as soon as they turned eighteen. It was a short lived union however, as her parents forced her to annul the marriage after just days together.

The Mortimers continued dating though, going on to remarry in May 2002. They are now separated, presumably for good this time.

Mortimer was in town to host an event for the Humane Society Friday night at SET nightclub