You’d never know Jennifer Lopez was 40 and a mother of twins just by looking at this picture of her wearing a sexy black strapless dress on the red carpet of author Scott Barnes‘ “About Face” book launch party at Provocateur at The Hotel Gansevoort Wednesday night (Jan 20) in New York City. But she is 🙂

Other celebrities in the building were J.Lo’s husband Marc Anthony, Kelly Rowland, Wendy Williams and Kat Deluna. More pics of everyone below and after the cut…

PHOTOS: GETTY IMAGES / WIRE IMAGE