Pitt peruses a painting at an art show in Basel, Switzerland. Plus: Kate Gosselin, Mariah Carey, Reese Witherspoon and more

PARTY ATTIRE

Mariah Carey makes it a sexy black-tie evening in her low-cut black gown at the Apollo Theater's 75th anniversary gala on Monday in New York City, where the R&B diva presented Patti LaBelle with her Apollo Legends Hall of Fame award.