Gavin Rossdale and Gwen Stefani
Credit: Stefanie Keenan/WireImage

Hollywood's hottest couples hit the town last night! In L.A., Gavin Rossdale and Gwen Stefani learned about the history of graffiti at the opening of Art in the Streets at the Museum of Contemporary Art, while Angelina Jolie and Brad Pitt took in a performance of the Tony-winning play God of Carnage. In New York City, Demi Moore and Ashton Kutcher got the word out about their husband-and-wife cause celeb at the launch of the DNA Foundation. See more photos from last night’s hottest parties in the gallery.