Video: Cher and Donny Osmond Delight at David Foster Concert

ET was exclusively behind the scenes with producer and songwriter extraordinaire David Foster for his star-studded show in Las Vegas last week, and we've got video of Cher and Donny Osmond backstage ! Plus, Clay Aiken opens up about the courageous Farrah Fawcett . Special guests who performed at David's May 7 extravaganza at the Mandalay Bay Hotel & Casino included Cher, Donny, Clay, Brian McKnight , Katherine Jenkins , Charice and Paul Anka . 'Hit Man: David Foster and Friends,' a one-night-only concert featuring David with Josh Groban , Katharine McPhee , Celine Dion and many more singing stars, is available on DVD now. Related stories: Marie Osmond Too Ill to Perform Update: Donny Osmond on Marie's Show-Stopping Illness

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Entertainment Tonight | May 13, 2009

Tags:. .extraordinaire. .charice. .mandalay. .extravaganza. .jenkins