Vanessa Hudgens and boyfriend Zac Efron are the stars of a rumoured  festive-themed sex tape.

Vanessa, of course, is no stranger to X-rated web scandals, having been the subject of nude pics that surfaced on the net last summer.

The new – and, we have to say, probably fake – footage is said to feature the 19-year-old High School Musical star sitting under a Christmas tree wearing only a Santa hat and matching red thong.

According to The Sun, the starlet turns to the camera and says: “I’ve been a good girl this year.”

It’s then than boyfriend and HSM co-star Zac suposedly makes his entrance...and you can guess the rest.