Brother-sister duo Donny and Marie Osmond just can't grasp the concept of flying solo! Donny — who is set to host the new game show Pyramid — is begging Buena Vista to make his sis the new host of the syndicated Who Wants to Be a Millionaire. "Marie would be perfect for Millionaire — although I don't know how she'd look in a tie," jokes the entertainer. Pyramid, reports the New York Post, will be coupled with Millionaire in about 40 markets this fall.