Joe Jonas and Demi Lovato Rock Out in Mexico City

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Demi Lovato might be devastated that her ex-boyfriend has moved on to a serious relationship with Ashley Greene.

But if this is the case, the young singer is doing a great job at hiding it.

Lovato took to the stage with Joe and his brothers in Mexico City Sunday night. She and her former lover even sang a duet together, entertaining fans with a rendition of "Wouldn't Change A Thing," the same single they performed on American Idol in March.

Check it out NOW and click on the following photos to enlarge pics from the concert:

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Demi Lovato Biography

Lovato
Many think Demi Lovato is being groomed to be the next huge Disney star. She appeared in the movie Camp Rock, alongside those gorgeous... More »
Born
Birthplace
Dallas, Texas
Full Name
Demetria Devonne Lovato

Demi Lovato Quotes

I hope to do a collaboration with Kelly Clarkson. [She] has been my idol growing.

Demi Lovato

I'm very uncoordinated. I'm surprised I don't fall onstage more.

Demi Lovato