Jason Derulo has said that Demi Lovato is a 'sweet girl' and revealed details about his collaboration with her.

'It Girl' star Jason has worked with Demi on her forthcoming new album and spoke to PopDash about his feelings for her and her new music. Asked when he first met her, Jason said:

"About a month ago in Miami, we were doing a track for her album together, I think her album's coming out in 4 days. I don't know if people really know who Demi Lovato is here. In the States she's really big. She's a very sweet girl, very passionate about her work, very excited, so I'm glad her record is good."

We also asked Jason about his trademark of singing his own name only to learn that a certain celebrity had recently done a great impression of him.

After saying it 'never' happened, Jason soon admitted the truth and said: "I'm just playing.  Kelly Clarkson did it yesterday". Adding: "She did do it quite good, I should've tweeted that."

Click here to read the full PopDash interview with Jason Derulo.