Oops! Raunchy Britney Sex Tape Leaks!

Britney Spears is still not that innocent!

RadarOnline.com has exclusively obtained a copy of a sex tape starring the 35-year-old mother of two, and according to a source close to the reigning pop princess, the scandal could send her over the edge — again!

In the footage, which RadarOnline.com has decided not to publish, Spears is topless while smoking what looks like a joint and gyrating on top of a secret lover.

According to an insider, Spears — who's recently fallen head-over-heels in love with a much younger male model, Sam Asghari, 22 — "is horrified this is happening to her after everything that she's been through."

"She's totally mortified and not coping well at all," the insider said.

"Every time she thinks she's finally put the past to bed, something comes back to haunt her ! A seedy sex tape is more than she can handle right now!"

However, as fans know, this is not the first time that a sex tape has reportedly surfaced — as the recently aired Lifetime biopic "Britney Ever After" revealed — the singer is reported to have secretly made a sex tape with then-boyfriend Justin Timberlake.

Although the footage of the new flick has been viewed by RadarOnline.com, a rep for Spears denied that such a tape exists.

Who do you think the costar of Britney Spears sex tape is? Tell us your thoughts below.