Capital FM Summertime Ball 2013

Taylor Swift - and a tiny pair of hotpants - take centre stage.

Presenter Justin Timberlake.

Another vote for the crop top from performer Ellie Goulding.

White hot: Jessie J.

If ever there was a man to get the crowd going, Robbie Williams is he.

Looking good, Will.i.am.

Now that's a crop top. Aluna George shows how it's done.

...Because there's no such thing as too much Taylor Swift.

Jessie J comes over all sports luxe for her perfomance.

Golden girl: Eliza Doolittle.

Our girl A*M*E strikes a pose.

A party's not a party till Psy is in the house.