Pop siblings DONNIE and Marie Osmond are to host the Miss U.S.A. pageant in April (08). The singers will also perform at the big show, which takes place at the Planet Hollywood Resort + Casino in Las Vegas. The event will mark the first time Donny and Marie Osmond have hosted a prime-time show together since 2000. The current Miss U.S.A., Rachel Smith, will give up her crown just before the glitzy glamour show.