Marie Osmond and Donny Osmond perform live for 'Good Morning America's Summer Concert Series' in Bryant Park, New York City, USA - 15.08.08

The pair initially agreed to perform a 26-week run of shows at the Flamingo Las Vegas hotel and casino kicking off on 9 September (08).

But their stint has become such a big hit, Flamingo President Don Marrandino has called on the duo to continue entertaining guests until October 2010.

Source: WENN