Liza Minnelli to Undergo Knee-Replacement Surgery

A rep for Liza Minnelli tells PEOPLE Magazine that the singer is planning to undergo knee-replacement surgery in the next week. "Minnelli, who has been dancing on stage she was a teenager, is 63," the rep says. "She is expected to make a full recovery."

Minnelli was expected to attend the Grammy Awards on January 31 where her original cast recording of 'Liza's at the Palace', her Tony-winning Broadway performance, is nominated for Best Traditional Pop Vocal album. Due to the surgery, Minnelli will be unable to attend.

LIZA'S AT THE PALACE.... was filmed in the Hollywood Theatre at the MGM Grand in Las Vegas on Wednesday, September 30 and Thursday, October 1, 2009 and will be released on DVD Feb 2, 2010 by MPI Home Video. All of the material performed during the New York engagement will be included. The program captures many of her greatest hits and includes an affectionate tribute to her godmother, the late Kay Thompson, who was a groundbreaking singer-dancer, songwriter, vocal arranger and musical director/vocal coach at MGM Studios.

She was joined on the program by her Broadway co-star and musical director, the legendary pianist, singer and composer Billy Stritch. Her quartet of dynamic singer/dancers, Cortes Alexander, Jim Caruso, Johnny Rodgers and Tiger Martina will recreate their roles as the Williams Brothers, which included the brilliant young Andy Williams and his talented siblings. The show will again be directed by Ron Lewis, the award-winning choreographer and director. Musical Conductor/Drummer is Michael Berkowitz, a well-known conductor of pop orchestras all over the world.