How cute!

Demi Lovato just got "engaged" and it's not to her longtime on-again, off-again beau Wilmer Valderrama.

Despite never having officially confirmed her relationship with the former "That 70s Show" actor and, never having given details about her love life, the singer took to social media to announce her "engagement" to five-year old Grant who popped the question onstage during her concert in Moline, Illinois. The concert is part of the leg of her world tour.

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Lovato posted a photo of the "proposal" on Instagram on October 12 and captioned it with "'Oh and by the way guys...... I'M ENGAGED!!!!!!!!!!!!!!!!! thank you to my future husband Grant... #CUTESTEVER #demiworldtour (sic)''

The singer shared that she had seen a photo of Grant, "the cutest little boy" online at one of her concerts, holding up a sign that read "Demi, I have a ring for you." She then brought her onstage.

Lovato joked that she though he was 45, so at least he was of age. She then asked for the ring so that they could make their engagement official.

After teaching Grant how to propose, the little boy knelt on one knee and said, "Demi, will you marry me?" as he held a bright green plastic ring in front of her. The amused star said yes, of course.

After accepting the little boy's ring, Lovato then said, ''I had to tell someone, 'I'm engaged someone beat you to it,'" apparently addressing Valderrama, her boyfriend since 2010.

Before entering into a relationship with Valderrama, Lovato had dated Miley Cyrus' older brother Trace Cyrus in 2009 and, had a brief relationship with singer Joe Jonas in 2010.

The star has previously struggled with eating disorders and substance abuse. After completing rehab in January 2011, she moved to a "sober house" in Los Angeles.