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Liza Minnelli Having Knee Replacement Surgery

The singer will be unable to attend the Grammys

Liza Minnelli is planning to undergo knee-replacement surgery in the next week in a New York hospital and will be unable to attend the Grammy Awards on Jan. 31, her rep tells PEOPLE. 

"Minnelli, who has been dancing on stage since she was a teenager, is 63," the rep says. "She is expected to make a full recovery." 

Read more at People.com.