Topless tizzy on the Riviera

Famous friend of Britain’s Prince Andrew Kazakhstan-born beauty Goga Ashkenazi threw a wild party at her St. Tropez villa over the weekend, complete with a topless crasher. Wealthy businesswoman Ashkenazi hosted 350 for dinner, then added another 200 guests to join an after-party. Revelers included Joan Collins, Blackstone’s Steve Schwarzman, Denise Rich, movie producer Lawrence Bender and model Victoria Silvstedt. Grace Jones performed in a black thong when a young woman, who guests described as a “party crasher,” jumped onstage and ripped off her top to “grind” with the rock goddess, before the intruder was “escorted out by security,” a spy said. While there was no Andrew in sight, his ex-wife, Sarah Ferguson, was also spotted on the Riviera Sunday dining with her friend Formula 1 racing tycoon Paddy McNally, his girlfriend and her daughter Princess Eugenie at Club 55, while George Soros relaxed at another table. Liam Neeson has been beachside with gal pal Freya St. Johnston and his two teenage sons. “She’s acting very much like Mrs. Neeson,” said another spy who spotted the couple. Neeson’s rep declined to comment.