Happy 30th birthday, indeed!

Jessica Simpson and her new fling, married former NFL player Eric Johnson, couldn’t keep their hands off each other on a yacht while they were celebrating her big day Saturday.

It’s just the latest steamy photo to surface from Simpson’s birthday celebration on the Italian island of Capri. On Friday, the couple of about five weeks wrapped their arms around each other while sightseeing.

The new issue of Us Weekly reports they’ve gotten very serious, very quickly. He’s already introduced her to his family, and she even attended his grandparents’ 60th wedding anniversary celebration — as this exclusive Us photo shows.

Simpson, who has faced failed romances with Tony Romo, Billy Corgan and John Mayer since divorcing Nick Lachey in 2006, once admitted that she thought her life would turn out much differently than it has.

“I thought I had it figured out; I’m going to be this great pop star, be married, have babies,” Simpson said. “But things can be taken from you.”

But an insider tells the new issue of Us Weekly that the VH1 reality star is “really happy” with Johnson, 30, who filed for divorce from his wife of five years last January.

Source: UsMagazine.com