The relationship of Demi Lovato and Wilmer Valderrama just keep getting stronger. The on-again, off-again couple seems to have found a way to make their relationship work out this time. Despite the age gap, they both look happy and healthy - plus their careers are going well.

The 22-year old singer recently posted a photo of herself and her 34-year old boyfriend on Instagram. She captioned the photo, "My love.... Always supporting me..." Demi hasn't been very vocal about her relationship with Wilmer, but lately we see her expressing how much the former "That 70's Show" star means to her.

Not many people know that the actor has always been by her side during her troubled times. Demi has gone through rehab for eating disorder in 2010; and she almost had a relapse in 2013 if not for her boyfriend. During an interview with Fitness Magazine, the "Really Don't Care" hitmaker revealed what happened to her last year.

She said, "I was obsessing over food and terrified of it at the same time. Wilmer noticed and called me out on it, which was a relief. I was done being afraid of food and so tired of overeating and not knowing why I did it. Now I'm on a structured meal plan."

The magazine also asked Demi Lovato what her motto in life is and she said, "If Beyoncé can do it, I can do it." She further explained, "If she can work out, have the incredible body she has, have a kid, and be as successful as she is, then I sure as hell can, too."

Now that success is within her reach and she's currently focusing on keeping fit and healthy, could the next step be marriage and having a kid?

A close friend of the singer revealed to Radar Online, "They are getting beyond serious." The source added, "She says that Wilmer is her soul partner and she could never see herself with anyone else." Do you think we will see Demi Lovato and Wilmer Valderrama get married by next year?