Celebrity pictures: The Saturdays, Justin Bieber, Jennifer Lopez

This weekend, The Saturdays celebrated their anticipated number one single by performing at G-A-Y. The show was the last one Rochelle Humes will be taking part in for a while, as the singer tweeted:

Justin Bieber also performed at the Unipol Arena in Italy. The heartthrob picked up the 'Favourite Male Singer' gong at the Nickelodeon Kids' Choice Awards last night, although he was not present to collect his trophy.

In the US, Jordin Sparks and Jason Derulo attended Perez Hilton's pyjama-themed birthday party, Jennifer Lopez performed at Muhammad Ali's Celebrity Fight Night in a glittering bodysuit and Kiefer Sutherland dined at Mr Chow Restaurant in Beverly Hills.

Elsewhere, Pixie Lott enjoyed a night at The Rose Club with her brother, Britney Spears had dinner at Meatball Spot at Town Square and Emeli Sand performed at Amsterdam's Paradiso.

See all of this weekend's pictures in our gallery below:

The Saturdays perform at G-A-Y. The show was the last one Rochelle Humes will be taking part in for a while as she prepares to give birth to her first child in the coming weeks.

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Copyright: WENN Chris Jep! son

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