Even though "Neon Lights" singer Demi Lovato has not admitted that she is dating on again, off again boyfriend Wilmer Valderrama the former "X Factor" judge posted a sweet Instagram message for the "light" of her life.

As rumors continue to swirl that the 21-year-old and her 34-year-old beau are engaged her latest picture is only fueling the claims.

According to Hollywood Life, through her toughest times the "That 70s Show" star has been there to support his girlfriend and on January 30th the "Heart Attack" singer decided to acknowledge his kindness.

The Disney alumni took to her Instagram and Twitter account to post three adorable photos of the happy couple together. Attached to the picture was a special birthday message for the actor.

Lovato wrote, "To the funniest, most inspiring, incredible man I know..@WilmerValderrama - thank you for helping me get through my darkest moments.. You truly are a light to this world and to my life.. Happy Birthday!!!"

Her beau responded and wrote, "@ddlovato who needs presents when the gift of you is real to us all.. Thank you for the blessing of knowing you."

Coincidentally the singer posted the heartfelt message a day after she was spotted wearing a ring while visiting her in the photo, Demi Lovato flaunts her hot pink hair and a gold ring on her left hand.

It was reported that over the holidays Wilmer Valderrama purchased a ring from Tiffany & Co. A saleswoman revealed, "He chose a really classic, beautiful ring."

The employee added, "Demi is going to be a happy girl when she gets it. He didn't say what it was for but he was really excited and happy - he seemed like any other guy getting ready to pop the question."

Do you think that Demi Lovato should be dating Wilmer Valderrama or would you like to see the star dating someone else? Let us know in the comment section below.