Today, Ashley posted a clip of her and Nastia singing 'Crank It Up' on her website and tweeted a note to her fans, reminding them to tune in. We also know that the duo performs another one of Ashley's hits, thanks to an announcement made by Nastia on her website: "Watch me do a special duet performance with Ashley [Tisdale] to her hit song, 'What If'!!!!"
Watch their collaboration on 'Crank It Up' after the jump. And if you're a mega gymnastics fan, there's even more good news...Shawn Johnson will also be performing during the show. Tune in on January 10!