Kelly Bensimon celebrated her 42nd birthday by posing in a fire engine red one piece bathing suit atop a luxury South Beach hotel, and RadarOnline.com has all the photos.

PHOTOS: Kelly Bensimon Shows Off Her Hard Bod On Her Birthday

One of The Real Housewives of New York City, Kelly, a sometimes swimsuit model, spends more time in Miami than she does in the Big Apple.

PHOTOS: Kelly Bensimon Rocks Out In Her Bikini

Maybe that’s where fellow reality stars, the cast of The Jersey Shore got the idea to shoot their new season in Florida.

PHOTOS:  The Jersey Shore Cast On The Beach In Miami

We’re sure to see them all partying together soon!