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Splish, splash, and all kinds of sexy! Cameron Diaz and boyfriend Benji Madden took their steamy romance to Orlando, Fla., over the Fourth of July holiday weekend. A source tells Us Weekly the happy couple were in the Sunshine State to visit Diaz's family.

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"She goes there every summer and spends time hanging out on the beach with her aunt and her mom," the insider tells Us. "She is super laid back and didn't hesitate for a second to introduce him to her family."

For her latest seaside excursion, Diaz, 41, showed off her long stems and flat tummy in cobalt blue bikini bottoms and a sky blue string top during the fun-filled day.

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Madden, 35, wore a pair of palm tree-print swim trunks and opted for no shirt, revealing his tattoo-decorated chest, arms, legs and fingers. The Good Charlotte rocker happily swam and goofed around in the warm Atlantic Ocean with his girlfriend.

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During an interview last month, Madden revealed that he's happy and "lucky" to be dating the former model. "You both got girls," Australian radio station Nova FM hosts told Benji and his twin brother Joel. "Life is good, man," Joel said, while Benji added, "We're lucky guys!"

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The insider adds of Diaz and Madden's burgeoning relationship: "For her, it doesn't mean much other than she likes having him around and they are having fun together. He is totally into her and she is just going with the flow and seeing what happens."