The all star cast of "The Hunger Games: Mockingjay - Part 1" walked the red carpet at the film's world premiere in London. Jennifer Lawrence joined co-star Josh Hutcherson. The film - one of the most hotly anticipated of the fall - is set to hit theaters worldwide on November 21.

Joseph Gordon-Levitt has signed on to play Edward Snowden in a movie directed by Oliver Stone. The still untitled film goes into production in Munich in January and will detail the life of the former National Security Agency contractor who blew the whistle on the U.S government's mass surveillance programs.

Cameron Diaz posed for photos at the Breakthrough Awards - a special event honoring the world's best mathematicians and scientists. In addition to Diaz, Jon Hamm attended - as did a slew of Silicon Valley power players, including Facebook founder Mark Zuckerberg.

Musician and philanthropist Bob Geldof, who in 1984 inspired a generation of rock stars to record a charity single for Africa,