The 19-year-old singer told the Daily Mirror she was horrified when she found the pornagraphic images on her Twitter account, saying: "It was disgusting - Dougie from McFly started it off by asking his fans to send me dirty snaps."

She added: "I clicked open these pictures on my Twitter account and it was all a bit weird, some people were really extreme and I just thought, 'Ok I'm not going to look any more' - I've seriously got to get McFly back."

Meanwhile, Pixie has been in Los Angeles working with Joe Jonas.

She said: "It's so exciting. I met Joe at the MTV Awards in Germany and now I'm working with him in LA.

"We wrote a song together in the studio, which I love, and we've been hanging out.

"We're not really partying because we aren't old enough to go to clubs in America - you have to be 21. So we go for dinner instead.

"I imagine there are a lot of girls who are jealous of me at the moment. He's such a lovely guy. But I'll be spending Valentine's day with my mum this year."

The Mamma Do star is nominated for three Brit Awards at next weeks ceremony, and wants to get a tattoo to celebrate if she wins, but her mother won't let her.

She revealed: "I really want a tattoo. That could be a way of celebrating, I suppose. But Mum won't let me. She thinks I'm too young."