Fourth time’s the charm? Jennifer Lopez and Alex Rodriguez are ready to take their relationship to the next level but her friends are worried she is moving way too fast.

The thrice-married singer has asked the former Yankees slugger to move into her Bel Air mansion, but a source tells Life & Style exclusively that those closest to her are worried.

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“A-Rod and J. Lo have spent the past couple of months traveling the world on private jets and acting like life is one big vacation,” notes the insider. “Her pals are concerned that once they’re out of the honeymoon phase, A-Rod will revert to his bad behavior.”

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Alex, 41, is a notorious playboy who has dated celebs such as Cameron Diaz, Kate Hudson, and Madonna in the past. However, Jennifer, 47, may have changed him for the better.

“She and Alex are absolutely crazy about each other,” the insider adds, “and they’re both ready to settle down.”

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The MLB star recently opened up about his new relationship and couldn’t stop gushing about the Puerto Rican beauty.

“It’s obvious — we’ve been having a great time,” he told The View co-hosts. “She’s a New Yorker, she’s from the Bronx — and a big Yankee fan. But we’re having a great time, she’s an amazing, amazing girl — one of the smartest human beings I’ve ever met, and also an incredible mother.”

He continued, “And she just likes simple things, she’s a very, very simple person — loves family, is a great sister, is a great daughter.”

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The couple spent Easter weekend together, and the family vacation, which included J.Lo’s nine-year-old twins Max and Emme along with Alex’s daughters Natasha, 12, and Ella, 9, seemed to seal the deal.

“Initially she was concerned there would be a rivalry since the children are all so close in age and are used to being the center of their parents’ world,” the source explains to Life & Style. “But as soon as the four kids met, it was like one big, happy family. J.Lo has always wanted to have a large family, so it’s a dream come true for her.”

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