Lindsay Lohan's on-off boyfriend Calum Best has had a cocaine-fuelled threesome with two prostitutes.
Calum, whose sometime lover Lindsay checked into rehab for the second time on Monday, has been filmed snorting cocaine and indulging in a variety of sex acts with the hookers.
After being confronted with the footage, the model told Britain's The Sun newspaper: "I've been stupid. I regret all of it. Whether it's alcohol, drugs or women, there comes a time when you think, 'I shouldn't be doing that.'
"I am a young man and I like to indulge, but look where it has got me - I feel ashamed."
The shocking video - which shows Calum preparing lines of cocaine before sharing them with the two prostitutes - was allegedly filmed after he returned from a romantic get-away with Lindsay in the Bahamas earlier this month.
Calum, 26, can be seen romping with both women, and at one point he licks the Class A drug off the body of one girl.
"Bobby" actress Lindsay was arrested for DUI (driving under the influence) over the weekend, and police reported they found cocaine in her car.
Calum - whose soccer legend father George Best, died in 2005 at age 59 following a lengthy battle with alcoholism - reportedly flew to the U.S. to see Lindsay before she entered rehab.
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