Britney Spears debuted new blonde locks on Monday, just in time to tape a guest appearance on "How I Met Your Mother." According to the cast of the CBS comedy, Britney was punctual, professional, and prepared. New look, new attitude? Maciel-MBF/X17 Online - March 10, 2008
From Britney Spears' primetime comeback to Paris Hilton's return to reality, see the celebrity stories that were big this week.