Selena Gomez took time out of her busy schedule to wish Radio Disney a happy 15th birthday with an acoustic rendition of her latest single, 'Who Says.' The 18-year-old star stopped by Radio Disney with her band, the Scene, as well as two back-up singers to help round out the performance.

The unplugged version of the song hit the Web on Monday, one day before Gomez's April 5 appearance on 'Dancing With the Stars.' She and the Scene performed 'Who Says' once again, but in full rock-out mode, while Mark Ballas and Chelsie Hightower danced before the live studio audience.

The Texas native's as-yet-untitled third album is slated for a summer release, and in addition to her promotional appearances, Gomez will be embarking on a full US tour, beginning on July 24. Allstar Weekend has been tapped as the opening act.

If 'Who Says' is any indication of how well Gomez's new album will fare, the outlook is pretty good for the Disney star. The single sold over 115,000 units in its first week, and was the No. 1 most-added single at Top 40 radio. Since its release on March 7, the video for the inspirational song has logged over 9.4 million views. Not too shabby!

Watch Selena Gomez & the Scene's Acoustic Performance of 'Who Says'

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