Robert Pattinson's sister Lizzy has revealed the Twilight hunk helped her choose the songs she would perform for her X Factor audition.

Aspiring singer Lizzy sent actor brother R-Patz the tunes she planned to perform for Simon Cowell at the judges' houses round in Los Angeles to see if he approved of her choices.

Lizzy told The Sun: "I sent him a link to the songs for judges' houses and he said, 'They sound really cool'. One of the songs was quite obscure and he thought it was really good."

Lizzy admitted she had not expected her Hollywood star bro to have been so involved in her taking part in the show.

She said: "I am surprised how interested he is in it.

"He watched the first episode I was in. He gave me feedback and that meant a lot to me."

And Lizzy also revealed her place in the live finals could be in jeopardy as she struggled with throat problems at the judges' houses audition.

She explained: "I started feeling ill the day before I left and it all came out at the wrong time. I did some swimming in the ocean, which probably didn't help.

"It could have come from anywhere, and maybe subconsciously I was a bit nervous about everything.

"I didn't feel like I had any control of my higher range.

"I didn't know what note was going to come out. So I probably pushed it more than I would have normally."