Kings of A&R — Washington D.C. reverberated to the sounds of partying for a second consecutive evening last night as Lady Gaga headlined a spectacular private event for thousands of Obama staffers. The singer, who wore a jaw-dropping white Versace dress, sang ‘Th... more info

411 Mania — She's been working on it for a while... more info

ContactMusic — Pop star Lady Gaga teamed up with Tony Bennett at a private ball for Barack Obama's staff on Tuesday (22Jan13) to thank them for their hard work... more info

ContactMusic — Lady Gaga still has ''a lot of work left'' to do on her 'ARTPOP' album. The 'Judas' singer is preparing to release her third full length album -... more info

Starpulse — Justin Bieber has overtaken fellow pop star Lady Gaga to become the most popular celebrity on Twitter.com. The Poker Face hit-maker broke a number of records as she clocked up millions of followe... more info

411 Mania — He's kind of popular... more info

Jam! Showbiz Music, Canada — Justin Bieber has overtaken fellow pop star Lady Gaga to become the most popular celebrity on Twitter.com. more info

ContactMusic — Justin Bieber has overtaken fellow pop star Lady Gaga to become the most popular celebrity on Twitter.com.The Poker Face hitmaker broke a number of... more info

E! Online — We're not saying this is all down to Justin Bieber's bare-bottomed twitpic, but we're sure it didn't hurt. In any case, the timing is everything, and not long after... more info

CNN Showbiz — In a perfect world, our most popular Twitterer might be a brilliant scientist, writer, philosopher or spiritual leader. In this world, he is an 18-year-old pop star with famous hair. more info