John Mayer & Jessica Simpson Wedding Bells?

Jessica Simpson, 26, could overtake ex-husband Nick Lachey and his girlfriend of one year, Vanessa Minnillo, in the race to the altar reports Star Magazine.

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 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.

In other news, Jessica Simpson and John Mayer continued their love tour with a late-night bite at Hollywood hot spot Citizen Smith on Monday reports E Online

Along with a group of about a dozen friends, Simpson and Mayer dined on mac & cheese, Buffalo Smith wings and a frozen hot chocolate.

The lovebirds were "very into each other" for the entire couple of hours that they were there reports E!.

DISCLAIMER: This posting was submitted by a user of the site not from The Insider editorial staff. All users have acknowledged and agreed that the submission of their story and its contents is in compliance with our Terms of Use.