For the record, Sebastian Ingrosso didn't co-write Britney's 'Work Bitch' and he's not really sure why his name was on that bit of paper from yesterday to be honest.
"I don’t really know why they put my name in there," he confirmed to Billboard. "It’s a really good song and I’m looking forward to what’s going to happen with it. But I can’t really take credit for it."
While he didn't actually write any of it, he is sort of responsible for its creation: "I’m good friends with will.i.am. He called me up and said 'I’m doing Britney's new album, do you have any beats for me to write on?'"
One of the beats he selected was by an act that he manages, Otto Jettman, and so he sent that over.
To be fair people have claimed writing credits for far less.