Blunt cheated on girlfriend with nurse

Photorazzi / Graffiti Press

James Blunt cheated on supermodel girlfriend Petra Nemcova with a student nurse after a concert.

Jenna MacDonald met the You're Beautiful singer after one of his gigs in June and claims that he lied about being single before spending the night with her.

"He's a rat and people need to know the truth about him," Jenna told the News of the World. "I loved his posh accent and I surrendered instantly as he sweet-talked me.

"As we fell into bed I thought, 'What the hell? He's a pop star.' He claimed he had no time for a relationship - but in reality, he was dating Petra. He told me there had been pictures in the papers of him with a girl on the beach but there was nothing going on. Later I found out she was his girlfriend."