Jessica Simpson and John Mayer's romance is going so well that they might even get married. The couple was reportedly seen checking out diamond rings at Cartier on March 8 during their six day trip to Rome.

John Mayer has also been telling friends “she’s the one he wants to settle down with,” says a source. “He says, ‘she has all the right ingredients, and she makes me laugh.’”

It’s an unlikely pairing, but apparently he’s found his soul mate: He wanted to have “a wife, a home, a degree of stability” before he turned 30 -- just six months from now!- says the source: “The clock is ticking for him!”

Expect a low-key proposal and a traditional, intimate wedding when their schedules clear up, adds the source.

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Labels: Engaged, jessica Simpson, Jessica Simpson and John Mayer, John Mayer, Marrying