The singer - who shot to fame on 'Britain's Got Talent' - is flying out to America to duet with her musical hero on 'Dancing with the Stars: All Stars' before joining Donny and his sister Marie on stage during their sold-out Las Vegas show next Wednesday (17.10.12).
Susan said: ''I am ecstatic at the moment. Going to LA to perform on 'Dancing with the Stars' with Donny and then off to Vegas to perform with Donny & Marie.
''I can't wait. Bring it on. I'm looking forward to Vegas and you never know I may have a wee flutter in the casino.
''I will also be making sure I do the helicopter ride over the Grand Canyon.''
The 51-year-old star is such a big fan of the 'Puppy Love' singer that she sleeps under a duvet emblazoned with his face at her Scottish home, and she can't believe her childhood dreams are coming true.
Susan enthused: ''I've said since 2009 that I'd love to sing in Vegas and now singing with Donny in Vegas well, I'm over the moon.''
The singing sensation has recorded two duets with Donny, 'All I Ask of You' and 'This is the Moment', which will feature on her new album 'Standing Ovation' released on November 19.