Wilmer Valderrama makes Demi Lovato ''feel confident and beautiful.''

The 22-year-old singer, who has been in a relationship with the 35-year-old actor for five years, admits she is ''really grateful'' to have him in her life and feels increasingly comfortable sharing details of their relationship with her fans.

The 'Cool for the Summer' hitmaker, who has battled addiction in the past, said: ''We don't share everything with the world. But we do feel comfortable to share a lot. With Wilmer and I and our relationship, he's extremely supportive in everything that I do. He makes me feel confident and beautiful. And I'm just really, really grateful for him.

''You just have to surround yourself with people that are going to lift you up spiritually. That's what I do. I surround myself with good people and really rely on others for strength whenever I need it.''

The brunette beauty is embracing her sexuality more as she gets older, but still wants to be a good role model for her younger supporters.

She told UsMagazine.com: ''I understand that it's a responsibility, and I do take it seriously. But of course I don't let that call all the shots. It definitely is in the back of my mind whenever I make decisions and choices in my career.

''I think my new music is definitely grown up. My music is definitely a lot more confident, sexier, and it's pretty much moving in that direction and embracing who I am as a woman.

''I'm 23 now so I think it came naturally. Your fans want to grow with you. It's about growing together with your fans. Ultimately when you make music it reflects your life and I'm a lot older now so of course it's not going to be about the same thing I was singing about when I was 16 or 17.''