The new 'X Factor' mentor, who has been linked to the Irish star for weeks, said he is really good friend, reported Daily Express.
"He's really sweet and he's one of my really good friends now. I am single at the moment and I plan to be for a long time, because I need to focus on my career and myself and my well-being before I think about getting in a relationship," she said.
Lovato, 19, is still keen to avoid any emotional turmoil after spending the end of 2010 and the beginning of 2011 in a rehab after suffering a breakdown.
She said that she can not even consider a romance as she copes with the drama of judging wannabe stars on 'The X Factor'.
"I didn't think it would be this challenging. Saying no to people is really hard. Emotionally, it messes with you a little bit. If you say no, what if that was their only shot and you let them go when they weren't really that bad?"
