Looks like Katy Perry and beau John Mayer may be tying the knot soon. Check out her ruby red ring ON her ring finger!

The sexy crooner reportedly popped the question to the "Fireworks" singer last night while the two enjoyed a sexy Valentine's Day dinner date at Vincenti in Brentwood.

Katy was all smiles while leaving the restaurant with her man, and of course, she couldn't help but show off her shiny sparkler!

The night before, Mayer and his ladylove hit up Katsuya in Brentwood for a sushi date. Wow ... these two have been inseparable!

Wonder what Perry's ex Russell Brand thinks about her settling down with Mayer?