So what have those celeb types been up to on Twitter this week? Lucky for you, we've trawled through their endless snapping to bring you the ten best pics over the last seven days. First up, besties Kelly Osbourne and Miley Cyrus showcased their matching pink pouts, Beyonce pulled on her finest Tibi gear for a game of basketball and Chloe Moretz made us seethe with jealously at the sight of her Four Seasons vay-cay in Bora Bora. Alright for some! But surely the biggest event on the Twittersphere this week was Alexa Chung's birthday. Harley Viera-Newton shared a photo of the style-setter about to delve into a ginormous cake while Derek Blasberg tweeted a pic of him, err, kissing Alexa in a temporary toilet at a Shanghai fashion party. In the words of Derek, let it 'be a testament to our ne'er ending love'. Aww!