During her recent guest appearance on Bravo's "Watch What Happens Live," Demi Lovato revealed why she unfollowed childhood friend Selena Gomez on Twitter.

As the first part of the "Plead the Fifth" game, Lovato was asked to "Shag, Marry, Kill" with the choices of ex-boyfriend Joe Jonas, Gomez's on-again boyfriend Justin Bieber and former fellow "X Factor" judge Simon Cowell -- her feelings about the Canadian pop star were quite obvious, as she did not even hesitate to say that she would kill him.

"I'd kill Bieber," the "Neon Lights" singer said before nicely covering up: "I'd kill Simon and f*ck that, kill Joe, too!" However, she quickly changed her mind about Jonas, saying "No, Joe and I are good friends, so I wouldn't kill him. I'd keep him around."

Host Andy Cohen also asked Lovato what was the most scandalous thing she had ever witnessed a Disney star do, not including her own behavior. Although she did not have to name the person, the "Camp Rock" actress pleaded the fifth.

Cohen then brought up about Lovato ending her friendship with the fellow "Barney & Friends" child star on social media in July. "You recently unfollowed your BFF Selena Gomez on Twitter. So much speculation about this," he said. "Can you tell us why?"

"I plead the sixth if that's in the game," the "Wouldn't Change a Thing" singer said. "I think it's just one of those things where people change and people grow apart."

Meanwhile, Demi Lovato has been encouraging Lovatics to vote for "Really Don't Care" as the Best Lyric Video at this year's MTV Video Music Awards. The process seemingly got a bit messy as she tweeted: "Wishing death upon anyoe is NEVER a joke.. please stop spreading that horrible TT. Now with that being said.. #VoteDemiLovato."