Liza! So nice of you....

Liza Minnelli performed at a Bat Mitzvah for the daughter of "US hair transplant pioneer Dr. Joel Kassimir" last weekend, and waived her usual $250,000 fee.

The ceremony was 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 performed five songs told Kassimir's daughter, "Enjoy being a girl because life goes by in a snap." How depressing...

Thanks Tori!