The "Skyscraper" singer added that she's "so proud" of her three-year relationship with Valderrama and is happy to share some of their romance with the world.
"We're in control of what we're able to post online, and we're very open about our relationship," she said. "As I get more serious in my life, I'm more proud. I also wanted to give him a lot of credit that he never takes."
"There were some moments when it was off and on when I was struggling with my issues," she told Sydney's Kyle and Jackie O Show on KIIS 106.5 in April. "What he would do is he wouldn't enable me so he'd say, 'I can't be around if you're not going to get your stuff together.'"
"It made me fight for it," she admitted. "He's a very, very good guy."