WATCH: Kelly Clarkson Performs Her Greatest Hits on 'Ellen'

The former American Idol winner rocks Universal Studios -- and confesses to a crush on a current Idol!

Kelly Clarkson (rocked and) rolled out some fan favorites during Wednesday's Ellen DeGeneres Show, singing a medley of some of her greatest hits.

The pony-tailed Grammy winner joined Ellen and a huge throng of fist-pumping, hand-waving, dancing revelers during the performance -- which was taped at Universal Studios theme park in sunny Orlando, Fla., on Sunday -- to belt out a medley consisting of Miss Independent, Walk Away and Since U Been Gone. Watch the performance below!

Clarkson's new album is set to debut in September -- and she has high hopes for it. "The album is gonna be a great pop record!" she wrote on her Facebook page. "I can't wait for ya'll to hear it!"

But it's not all work and no play for Clarkson, who took some time to explore Universal after entertaining the crowd on Universal's CityWalk. "We spent all day yesterday at Universal Studios in Orlando and had the time of our lives!" she wrote on Facebook on Monday. "Loved the rides, LOVED all the Harry Potter stuff (especially butterbeer:), loved being on the Ellen show, and our guides were fantastic! Seriously, can't wait to go back!"

Clarkson, who won the first season of American Idol, is apparently an avid TV watcher as well, at least of one particular show. After Wednesday night's Top 9 performances on Idol, Clarkson showed some tweet tweet love for bushy Idol contestant Casey Abrams.

"I might have a bit of a crush on Casey on American Idol this season," she wrote on her Twitter page. "He's super cute and obviously super talented. Great job tonight man!"

Could love be in the air? If so, we're sure to hear about it when one of them pens a new tune.

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