It might be Girlfriend...i remember her rapping in one of the sections of that song...and she goes hey hey you you i can be your girlfriend...and stuff...and then at the end of her rapping she goes yeah yeah yeah no way no way no way! lol so i think it'd be girlfriend lol
Well I googled it and it could be either Forgotten (which, granted is an old one) or What the Hell (which is relatively recent).
No... It's that Rihanna song. I don't know what it's called, but if you look on youtube or something you'll find it.
It's called "Cheers (Drink to That)". It's Rihanna's song, featuring Avril. Here's the song:
thanks so much :)