This is beyond cute. And fair play to the eagle-eyed cameraman who clocked it - just a shame Rita bleedin' Ora sensed a camera was focussed on someone in her vicinity and just had to stand up to steal the thunder. Jessie J isn't the only one cursing her.
In other 'best reactions of the night' - we'd like to note Gwen Stefani's reaction to Taylor Swift's performance. And the crowd went wild.