January 12, 2016 12:20 PM

Congratulations are in order for Demi Lovato and Wilmer Valderrama!

The adorable duo celebrated their sixth anniversary on Sunday – and the singer was sure to honor their milestone on Instagram.

“6 [heart emoji],” Lovato, 23, captioned her selfie with Valderrama, 35. The sweet snap shows the musician and actor snuggling up to each other.

Wilmer Valderrama and Demi Lovato
Source: Demi Lovato/Instagram

Lovato followed it up with a collage of special moments spanning their fruitful relationship. She let their loving photos speak for themselves, only including a heart emoji in the caption.

But the “Irresistible” vocalist’s connection with the former That ’70s Show actor goes much deeper than what meets the eye.

“I really wouldn’t be alive today without him,” she explained in a post about her three-year anniversary of sobriety in March. “I love you Wilmer.”

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