is back to doing what she does best!

The "Timber" singer hit the stage at the El Rey Theatre in Los Angeles on Thursday night to perform for the first time since her stint in rehab for an eating disorder.

One lucky fan posted a video of the pop star belting out Tom Petty's classic hit, "Free Fallin" -- and she sounded amazing. Check out her singing chops in the video below.

We're happy to see the 27-year-old getting back to her musical roots!

Kesha looked happy and healthy at her first red carpet appearance since treatment last weekend too, sporting short blonde and green hair, a black and gold gown, and of course, a gold tooth.

Earlier this month, the singer took to Twitter to thank fans for their support.

"Happy to be back! Feeling healthy & working on tons of new music. I can't thank my fans enough for all the love & support u have given me," she said. "Life is beautiful. I'm so blessed to have u all."

What do you think of her comeback? Tell toofab in the comment section below, and click "Launch Gallery" below to see Kesha's best TwitPics!


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