Girls Aloud singer Sarah Harding is cheating on her boyfriend, according to The Mirror today.

Sarah, 21, has been dating Mikey Green - singer with Popstars reject band Phixx - for ten months.

Recently she has been caught "sneaking off for secret trysts" with Triple 8's Josh Barnett, however, the newspaper reports.

"Our spies caught her creeping into the West London house that 20-year-old Josh shares with the rest of the band last Thursday night," said the article. "She emerged the next day with a satisfied grin on her face."

One of her close friends said: "She got close to Josh because both of their groups go to the same parties and perform at the same concerts. She didn't plan it. It just happened.

"Sarah's young, pretty and in a successful band so she's bound to have her pick of men. She really doesn't want to be tied down.

"As much as she enjoys Mikey's company, there's no denying that there's chemistry between her and Josh. She hasn't said whether she wants to turn it into a permanent thing - she's just having fun. I just hope that she doesn't end up getting burnt."