Dermot O'Leary shows off his X Factor
dance moves, Lady GaGa dines with WikiLeaks founder Julian Assange
, and Rihanna poses topless - we take a look at the best celebrity tweets of the week.
Una Healy shares a picture of herself and Ben Fodden on her 31st birthday, tweeting: "My birthday present has arrived!!! :)"
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New! Digital Spy
breakfast show - watch Daniel Sperling discuss the day's biggest stories including Rihanna's next album, Quentin Tarantino's Django Unchained
and The X Factor