DONNY and MARIE OSMOND have a huge announcement to make: The celebrity pair are reuniting to perform together again for an incredible stage show at the MGM Grand in Las Vegas, from July 17-23.

"Marie and I have decided we're coming back together again," Donny tells ET's MARY HART. "The two of us can hardly wait."

The two entertainers have been through a terribly emotional year together, what with their father passing away earlier this month and Marie's dramatic ups and downs on "Dancing with the Stars."

This intense time allowed the pair to grow even closer together, and they decided it was time to relive the magic of their days on their TV show, "Donny & Marie" -- with a touch of old-Vegas style!

"Both of us are so excited," says Donny. "It just feels fantastic; there's going to be heart and soul to it. The chemistry that we have together, that's the key element of the show."

Watch ET for more exciting news from Donny and Marie!