Spears steps out in a body-baring outfit to go clubbing in Hollywood. Plus: Daniel Radcliffe, Kelly Clarkson and more


Leaving the halls of Hogwarts behind for the moment, Harry Potter pals Rupert Grint, Emma Watson and Daniel Radcliffe make an appearance Monday in front of London's Big Ben to promote their newest adventure Harry Potter and the Order of the Phoenix, which opens July 11.

Test yourself on our Harry Potter pop quiz here.