New Moon star Taylor Lautner reportedly snuck into a concert to support rumoured girlfriend Taylor Swift.

The 17-year-old actor turned up at the KIIS FM’s Jingle Ball to see Swift, 19, perform and he remained unnoticed.

An onlooker said: “He came with his bodyguard and was backstage the whole time.”

The onlooker added: “No one knew Taylor was there. It was obvious he didn’t want to take away from her special day. He was there to support her.”

It is claimed he was seen bobbing his head to her music while watching her sing.