Sources tell The Hollywood Reporter the 24 year olds will feature in a shocking sex sequence that will involve dozens of naked extras, but, ironically, Miley and Jensen, will be among those who keep their clothes on.

The second season of the cult drama series will feature Colin Farrell, Rachel MCAdams and Vince Vaughn.

HBO bosses behind the steamy scene have declined to comment, but insiders insist the X-rated actresses simply signed up with the casting service the show is using and were employed along with dozens of other extras who were willing to strip off for the TV show.

Miley was recently named the 44th hottest porn star by Complex magazine.