KEGILAAN MUAMMAR GADDAFI

By RHONDA SCHWARTZ, CHRIS JAMES, RANDY KREIDER and LEE FERRAN

Flanked on all sides by beautiful women, Mutassim Gadhafi, son of embattled Libyan leader Moammar Gadhafi, sat in a crisp white shirt with his hair slicked back and quietly sipped expensive champagne straight from the bottle on a lush Caribbean island while Beyonce serenaded him on New Year's Eve 2009.

Mutassim looked perfectly at home amid luxury and celebrity -- a man who seemed "accustomed to that kind of life," Tom Groves, one of the lucky few invited to the bash, told ABC News.

If Mutassim was in his element, it may be because the reportedly million-dollar bash was a repeat of the same party he threw exactly a year earlier at the same St. Barts nightclub, except with a different diva on the mike. On New Year's Eve 2008, Mariah Carey provided the entertainment, according to a leaked U.S. State Department cable that described Mutassim's island bashes in detail. That cable, along with several others posted on the website Wikileaks, also tagged Mutassim and several of his seven brothers as "hard-partying" and "womanizing" playboys.

Video shot by Groves, which was obtained by ABC News, shows an intimate affair with Beyonce singing several songs just feet away from party-goers. In other videos of the party posted on YouTube, celebrities Jay-Z and Usher are seen together ringing in the New Year. Groves said among the 150 attendees were other A-listers like Jon Bon Jovi and Lindsay Lohan -- all treated to Cristal champagne.