Jessie J was there of course, but was controversially bereft of a ridiculous onesie and instead rocking a kind of 'sexy' sailor look. Other performances came from the likes of Cher Lloyd, Rizzle Kicks, Pixie Lott, Dappy and Example.
You can see some pictures of it all over on the Metro site and look out for a controversially hatless Matt Cardle while you're at it.
In other Jessie J news, the Daily Star are reporting that Jessie is keen to record a duet with 'best friend' Tulisa.
"We’ve talked about writing a song like 'Do It Like A Dude' together," she's quoted as saying. "A big girl power anthem because we are both feminists." Totally.