Selena Gomez puts on her happy face(s) for a Memorial Day party in Malibu.

While you spent Memorial Day shoving that third hot dog in your mouth and watching a "Law & Order" marathon (just us?), Selena Gomez attended a star-studded beach house event in Malibu thrown by movie producer Joel Silver. She brushed elbows with some pretty famous guests such as Gwen Stefani, Gavin Rossdale and Barbra Streisand. (No word on who brought the potato salad, but we're putting bets on Gwen -- moms are always the best cooks.)

The "Love You Like A Love Song" singer and BF Justin Bieber may have experienced one hell of a nasty run-in with the paparazzi this weekend, but girl still put on a happy face (and an equally smiley dress) to attend her holiday social commitments. And while Selena seemed happy arriving sans Justin, we're pretty sure he was on her mind the entire time. How do we know? Um, if we were dating Biebs, he'd be constantly shirtless in our thoughts ALL. DAY. LONG.

Photo credit: Splash News