By Karen Valby
Updated January 10, 2010 at 10:48 PM EST

The 63-year-old show-woman will undergo knee-replacement surgery in New York next week, reports People. The procedure means Minnelli will miss the Jan. 31 Grammy Awards, where Liza’s at the Palace, the original cast recording of her Tony-nominated Broadway production, is up for best traditional pop vocal album. Get well, hoofer!