The always sexy and fabulous Jennifer Lopez celebrated her 46th birthday with a VIP Bash at 1 OAK Southampton. Our sources report that after she arrived in a curve-hugging black mesh cut-out dress that left nothing to the imagination she hung out with her VIP friends, including on-again off-again boyfriend Casper Smart, near the DJ booth. Mixmaster of the evening Mel de Barge kept the room rocking with a series of JLo dance faves. We hear that the former Fly Girl was dancing all night long as her tunes played. While former flame Sean “P. Diddy” Combs was conspicuously absent for the fete there was an endless supply of his CIROC Vodka and bottle upon bottle of champagne. A gift perhaps? Like any other Birthday Girl, JLo had fun in a photo booth with her BFF’s including Natasha Bedingfield, Charlie Walk, Olivia Culpo, Ronnie Madfra, Dayo Okeniyi, and Khloe Kardashian‘s former arm candy French Montana. Royal Pains star Mark Feuerstein was also spotted in the mix.