Demi Lovato Calls Wilmer Valderrama the ‘Most Incredible Man I Know’

Wilmer Valderrama and Demi Lovato
Demi Lovato praised rumored boyfriend Wilmer Valderrama as the "most incredible man" she knows Jeff Vespa/Getty Images

Demi Lovato is in a very happy place.

The 21-year-old singer "Heart Attack" singer historically has been tight-lipped about the nature of her relationship with Wilmer Valderrama, despite the fact they've been linked for years and were snapped holding hands in October. But when the "That '70s Show" alum turned 34 on Thursday, the one-time "X Factor" judge paid tribute to him a very public way.

[Related: Demi Lovato's Surprising Reaction to Joe Jonas's Drug Comments]

"To the funniest, most inspiring, incredible man I know.. @WValderrama – thank you for helping me get through my darkest moments.. You truly are a light to this world and to my life.. Happy Birthday!!!" she posted on Twitter.

Along with the affectionate words, Demi posted a photo collage of them together. In the three pictures — which were snapped recently judging by her new pink hair color — they appear as close as can be and are very playful.

[Related: Demi Lovato Talks Us Through Her Many Mane Makeovers]

He quickly replied:

[Related: Demi Lovato Is Pretty in Pink—Literally! See Her New Fuchsia Hair]

What you can't see in the pix, however, is whether or not Demi is wearing the sparkly new ring she's been seen sporting on that finger. Yesterday, she made her way through LAX airport in Los Angeles with the ring and a smile.

Reps for Lovato and Valderrama have not responded to our requests for comment about a possible engagement, but denied it to E! News.

It's the first public declaration that the singer made about the actor, and she explained her reasoning behind keeping her private life private during a radio interview last year.

"I've talked about my struggles so much I don't feel it's really necessary for people to know my love life," she said on JohnJay and Rich in the Morning. "When you share so much with people, you've got to keep some things to yourself."

Talk of romance between the pair began back in 2010 after she split with Joe Jonas. In October of that year, she sought treatment for emotional issues and drug addiction, hence her reference to him helping her through her "darkest moments." While they've kept their relationship very under the radar, last year they were spotted enjoying a Disneyland date for her birthday, and, on her big day, he took to Twitter to write, "I've been so proud of the strength & commitment you've gained 4 life, keep inspiring us all! Happy birthday my @ddlovato! With & by u always."

Then, in October, we issued a "PDA alert" when they were spotted canoodling at Knott's Scary Farm Haunt.

[Related: PDA Alert! Demi Lovato & Wilmer Valderrama Hold Hands During Date Night]

It's nice to see that their affection remains strong. We're all for a happy Demi.

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