Serena Williams and her sister Venus cover the latest issue of Hamptons magazine. To celebrate, the duo partied at RDV in New York, but the similar-looking sisters couldn’t have dressed any more differently. Venus wore a shimmery purple tank dress, while Serena showed off her “ass”ets in a black skin-tight catsuit that (thanks to camera flash!) revealed more than expected. See for yourself! WTH Are Serena Williams & Lala Vazquez Wearing? Beautiful Battle: Khloe vs. Serena In McQueen [PHOTOS] Serena Williams Flaunts Beach Bod In Miami [PHOTOS]