Brad Pitt was joined by famous friends last night when he hosted a special screening of his new film World War Z at the Museum of Modern Art in NYC. The appearance marked his first public event since Angelina Jolie announced her double mastectomy news. Stars like Bruce Willis, Kevin Bacon, and Jimmy Fallon dropped by the advanced showing of the movie, which hits theaters on June 21, and the fun continued when Brad headed to an afterparty at the 21 Club with Kevin and his wife, Kyra Sedgwick. Earlier yesterday, Brad surprised fans by showing up at a screening in New Jersey.

This MoMA event may have been Brad's first public appearance since Angelina announced her double mastectomy news, but Brad started press for his latest project earlier this month. Brad gave an interview to Esquire magazine and revealed that he has a hard time remembering people's faces. He also touched on his family life with Angelina, whom he called "the best person." The couple has been lying low since she opened up about her surgery, but they will most likely step out together on the red carpet when Brad premieres World War Z in June.

George Clooney left London's Nobu restaurant last night after dining out with friends. George's stop comes just a few weekends after he escaped to Lake Como with Matt Damon and producer Grant Heslov during a break from filming their new project, The Monuments Men, in Germany.

While George stopped over in London, Matt arrived in the South of France on Tuesday for the Cannes Film Festival and premiered Behind the Candelabra with Michael Douglas. George's girlfriend, Stacy Keibler, also hit the Cannes scene to attend a slew of events, including Roberto Cavalli's yacht party last night and a sit-down at the Stella Artois Suite earlier in the day. While at the Stella event, Stacy revealed she would like to film more romantic comedies and that she is particularly fond of Tom Hanks.