Last year, reports suggested Lovato checked into treatment because she was devastated over her break-up with Joe Jonas and couldn't cope with the sight of him romancing then-girlfriend Greene.
The 'Twilight' beauty has now spoken out to set the record straight, insisting there is no real tension between the girls but she'll forever be asked about Lovato - since they fought over the same man.
She tells Allure magazine, "I'm really happy that she's (Lovato is) doing well. She and I never had a problem with each other, but, you know, it doesn't go away... Jen Aniston still gets asked about Angelina Jolie."
And to confirm there's no hard feelings, Ashley and Demi were even tweeting to each other recently.
Also in the new issue of Allure, Ashley opens up about Robert Pattinson. "Rob. Oh, Rob. He's very endearing, but you've seen his interviews. He's like, 'Ah, I don't know.... Oh, God,'" Ashley joked before doing an impression of Rob. She also called him a "phenomenal actor."
Ashley's issue of Allure is on newsstands October 25.