Cher Lloyd left the stage after she was booed and hit by the bottle, before shortly returned to finish her set.
Tulisa, who was also at the event, hit out at the revelers who 'bullied' the teenager in an interview with Capital FM this morning.
She told the radio station: "I just call it adult bullying, it's ridiculous. You think when you get older people get over that sort of stuff and people forget how young she is and vulnerable."
And Tulisa claimed that she had become used to ducking and avoiding bottles while on stage as part of N-Dubz.
She explained: "I get bottles thrown at me all the time, but I'm so used to it that I'm just ducking and diving and carry on singing.
"You know me, I'll have a go at the person who does it anyway so it doesn't really bother me as much. But for someone like her, I just think, she's only young. It's out of order."
Writing on Twitter after the performance on Sunday, Cher said: "Thank you so much for all the nice messages, shame that a couple of people had to ruin it, unfortunately a glass bottle got thrown at me on stage.Tomorrow is another day,big love to my brats!!! Xxx"