Demi Lovato refuses to hold her tongue!

During an interview with Billboard, the star got very candid about the way she felt towards pal Nick Jonas’ ex-girlfriend Olivia Culpo — and let’s just say it wasn’t pretty!

During his split with the former Miss USA, Nick admitted that he confided in Demi frequently and would often ask for advice concerning the relationship, which the "Heart Attack" singer had no problem giving.

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“I go, ‘Honestly, I didn’t like her anyway,’” Demi told Billboard. “It’s not because she’s mean or anything, but he has such a great sense of humor and I want him to be with someone that makes him laugh. I can tell if something’s up because he’ll close off.”

demi lovato and nick jonas

If that’s isn't enough of a jab, Demi even told her tour-mate to dump the pageant beauty and enjoy life as a single 20-something.

“He’s a guy in his twenties and he’s famous and he likes to have a lot of fun,” she continued. "Listen, even when he was in a relationship, I was like, ‘Get out of that. You could f–k anybody that you want right now, so have fun and do that.'”

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Demi is a newly single lady as well, since splitting with Wilmer Valderrama after six years of dating. She’s even been on the prowl as of late; just yesterday she was spotted with NFL star Odell Beckham Jr. in NYC on what seemed to be a date.