John & Jessica Wedding Bells?

Will Jessica Simpson, 26, overtake ex-husband Nick Lachey and his girlfriend of one year, Vanessa Minnillo, in the race to the altar? Her on-again romance with singer John Mayer, 29, is so hot that the couple was reportedly seen checking out diamond rings at Cartier on March 8 during their six day trip to Rome ! And John has been telling friends “she’s the one he wants to settle down with,” says a source. “He says, ‘she has all the righ tingredients, 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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