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'Thor' stars bring 'Dark World' to London, and more Celeb Sightings

Image: Chris Hemsworth, Natalie Portman and Tom Hiddleston
LONDON, ENGLAND - OCTOBER 22: (UK TABLOID NEWSPAPERS OUT) (L-R) Chris Hemsworth, Natalie Portman and Tom Hiddleston attend the world premiere of \"Thor: The Dark World\" at The Odeon Leicester Square on October 22, 2013 in London, England. (Photo by Dave Hogan/Getty Images)Dave Hogan / Getty Images
The stars of 'Thor: The Dark World' on the London red carpet, Miley at the 'Night of Stars,' Katy Perry celebrates her new album release, and more.