Jessie J praised Team GB's athletes for their amazing efforts in the Olympics at a concert in London on Saturday night (04.08.12).

The 'Price Tag' star performed at The Roundhouse, in Camden, London, for a special concert sponsored by VitaminWater on the same evening British competitors Jessica Ennis, Mo Farah and Greg Rutherford all won gold medals at the London 2012 Games.

Jessie wasn't short of praise for the squad's incredible achievements so far, telling fans: ''This is a shout out to everyone who's put their dedication and hard work into Olympics. So proud of every athlete representing GB. Go GB! They haven't made any mistakes.''

One heckler from the audience then shouted ''nobody's perfect'' - a reference to her hit single of the same name - which made Jessie laugh.

A number of Team GB athletes were invited to the Glaceau VitaminWater presents 'Jessie J Live In London' show, including Zoe Smith, Hannah Whelan, Rebecca Tunney, Imogen Cairns and Jennifer Pinches.

The show also attracted a host of stars including Girls Aloud singer Sarah Harding, Rolling Stones guitarist Ronnie Wood and Chipmunk.

Jessie, 24, urged everyone, including the VIPs in attendance, to grab a dance partner for her version of 'All My Love'.