Superstar Demi Lovato has revealed that her boyfriend, actor Wilmer Valderrama, is good friends with her ex-beau Joe Jonas and she thinks it's a little weird. 

In the September issue of Cosmopolitan magazine, the 'Cool For The Summer' sensation confessed that they're good pals and it makes her feel a bit uncomfortable: "Nick (Jonas) and Wilmer get along great—Joe (Jonas) and Wilmer, too. It's weird. In the beginning, I was like, 'Why the f--k are you friends with Joe?' He was like, 'He's a cool guy'... 'Yeah, I know. I dated him'."

As previously reported, Lovato also opened up about her relationship with Valderrama and admitted that it was rocky in the beginning: "We started dating when I turned 18...Right after that, I went to rehab. People told him, 'You should probably leave. She's on a spiral, and you're going to be sucked down with it.' But he was like, 'I'm not leaving. This is somebody I really care about'. We relate on a lot of levels. I've seen a lot of s**t. S**t people don't know about."

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Watch Lovato's music video for 'Cool For The Summer' below: