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It's been reported that Jennifer Lopez is ready to take her relationship with Alex Rodriguez to the next level as she has moved in with the former MLB star after just three months of dating. But her pals are worried the "On the Floor" hitmaker is moving way too fast with her romance, according to Life & Style.

"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," an insider notes, before revealing, "Her pals are concerned that once they're out of the honeymoon phase, A-Rod will revert to his bad behavior."

The webloid goes on to point out that A-Rod "is a notorious playboy who has dated celebs such as Cameron Diaz, Kate Hudson and Madonna in the past," but J.Lo may have changed him for the better. "She and Alex are absolutely crazy about each other," adds the insider, "and they're both ready to settle down."

As previously reported, the new couple's already talking about babies and marriage, and J.Lo's taking the first step down that road. "J.Lo asked Alex to live with her in her $28 million mansion in Bel Air, and he agreed," an insider revealed. "The couple have barely spent a moment apart since they started dating and are ready to take things to the next level."

According to the insider, the 47-year-old singer made the decision after seeing how well her nine-year-old twins, Max and Emme, got along with the 41-year-old hunk's two daughters, Natasha and Ella, during a recent family getaway.

"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," explained the insider. "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."