Kelly Clarkson continued her U.S. tour last night at the Hollywood Bowl -- where she unleashed another cover of someone else's hit.

The original "American Idol" winner has been performing covers every on every stop of her tour ... and in the past week she's done renditions of Britney Spears, Katy Perry and fun. songs.

On Monday, Kelly sang a slowed down version of fun.'s massive hit "We Are Young" -- which, thanks to Clarkson's amazing voice, the audience loved.

The fun. cover comes days after she performed Britney's ballad "Everytime" in Las Vegas.

And days before that, she tackled Katy Perry's emotional new single "Wide Awake":

How can we get Kelly to release a cover album?!

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