–Third time's the charm: Britney Spears' new single, "3," will debut at No. 1 on Billboard's Hot 100 on Thursday, making her the first artist in three years to debut a single atop the chart. [Perez Hilton]
–Retweet this! Summit Entertainment has launched an official Twilight Twitter page, with followers being alerted to new New Moon promo stills and behind-the-scenes info. [Just Jared]
—Gossip Girl's Leighton Meester enlists the aid of R&B crooner Robin Thicke for her latest single, "Somebody to Love" — and proves she might just make it as a singer! [PopEater]
–Who are you again?! Tracy Morgan is slamming his former SNL costars in his new book, "I Am the New Black," out next week. "All I have to say about that is, where's Chris Kattan now? Where's Cheri Oteri now? That bitch can't even get arrested," he writes, criticizing the pair's current careers. [OMG]
–Singer Leona Lewis is shaken but OK after being attacked at an autograph signing in London, where a man waited for 90 minutes in line before walking up to Lewis and punching her in the head. [Fox News]
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!