Liza Minnelli performed at a Bat Mitzvah celebration for the daughter of US hair transplant pioneer Dr. Joel Kassimir on Saturday - and waived her usual $250,000 fee. The 60-year-old performed five songs at Charlotte Kassimir's coming of age ceremony at New York's Marquee club, which was decorated with pink and white crystals by designer Ed Libby at a cost of $1 million. A source tells the New York Post, "Liza is an old family friend and did it as a favor. She can command $250,000 a show and usually doesn't get out of bed for less than that." Minnelli, watched by guests including former champion boxer Lennox Lewis, told Charlotte, "Enjoy being a girl because life goes by in a snap."