Demi Lovato had a surprise for her fans at her LA concert this week -- a little duet with Nick Jonas!
Demi is currently touring America on her Summer Tour, and she performed at the Greek Theatre in LA on Wednesday night.
See Demi's best X Factor looks
During the show she told the crowd that some of her friends were in the audience, and added "luckily some of my friends are going to help me out tonight on stage."
The crowd's reaction was crazy, and the screams got even louder when she revealed that the friend she was talking about was Nick Jonas!
The pair performed 'Catch Me' from Demi's album 'Here We Go Again', with Nick playing guitar during the song.
Demi dated Nick's older brother Joe back in 2010.
The video on this clip isn't perfect but the audio is great. Check it out below. We wish we could have seen this live!
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