Katy Perry Engaged to John Mayer?

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Katy Perry has sparked rumors that she'll be walking down the aisle once again after stepping out on Valentine's Day with beau John Mayer wearing a new sparkler on her wedding ring finger.

Though the 28-year-old pop star's rep had "no comment" for ET on an engagement, Perry and Mayer were all smiles as they left Vicenti restaurant in Brentwood, Calif. on Feb. 14, Perry wearing a red-stoned ring.

RELATED: Mayer Talks Past & Present Romances

Mayer recently commented to CBS' Sunday Morning about his relationship with the musician, calling it "very human." "I don't feel like I'm in a celebrity relationship," the singer/songwriter told Anthony Mason. "For the first time in my life I don't feel like I'm in a celebrity relationship. I really don't. I'm not in a high profile, I know it's high profile. It's hard to explain."

When asked about marriage, Mayer answered, "Of course. I mean, I'm still the kid from Connecticut. That's what you do."

Katy was previously married to funnyman Russell Brand, but the two announced their separation in Dec. 2011.