The British retro-soul singer was to perform at the Sept. 9 event in Las Vegas, but her U.S. record label, Universal Republic Records, said Wednesday that all U.S. appearances have been canceled "in a continued effort to support Amy Winehouse's well-being."
It is the latest setback for the gifted-but-troubled 23-year-old. Last week, she was photographed with her husband, Blake Fielder-Civil, bloodied and bruised after an apparent fight in a London hotel.
She canceled a series of British concerts and postponed a tour of the U.S. and Canada after British media reported that she was in and out of rehab recently.
Winehouse made her U.S. debut this year with the acclaimed album "Back to Black," but her tabloid troubles have often overshadowed her talent. She's spoken openly about her past battles with drugs and her penchant for alcohol and marijuana. Her hit single "Rehab" is an autobiographical tale of her resistance to being pushed to go to rehab.