Actress/model Jenny McCarthy is rubbishing reports she once had lesbian sex in a Las Vegas, Nevada, lavatory after porn queen Jenna Jameson made the shocking claim on a recent HOWARD STERN SHOW.

Jameson told the New York shock jock that former Playboy Playmate McCarthy gave her oral sex in a restroom stall.

But McCarthy is laughing off the porn star's sex romp story.

Her publicist LAURA BASS says, "This story is completely untrue."