Miley Cyrus falls sick

London: Singer-actress Miley Cyrus, scheduled to perform on former American boxer Muhammad Ali`s birthday, is suffering from a bout of ill health.

Cyrus willl hit the stage with Lionel Richie, Rascal Flatts and actress-turned-singer Rita Wilson at Celebrity Fight Night in Arizona Saturday. The performance will be part of Ali`s 70th birthday celebrations, reports

"Laying in bed sooooo sick, send me positive energy! Gotta get healthy before celebrity fight night! Everything hurts," tweeted the 19-year-old.