In addition to celebrating the opening, the Osmonds also celebrated Donny's birthday with an enormous cupcake.
The Osmonds, who are brother and sister, have worked together in television, notably on their own variety series Donny and Marie, and in Las Vegas.
Donny Osmond's stage credits also include Little Johnny Jones, Joseph and the Amazing Technicolor Dreamcoat and Beauty and the Beast; while Marie Osmond's stage credits include The King and I and The Sound of Music.
Both performers also appeared on separate seasons of ABC's Dancing With the Stars, with Donny being named champion in fall 2009.
Don't show this again.