The Sex Tape star, 41, and the Good Charlotte rocker, 35, visited Diaz's family over Independence Day. "They flew into Orlando and then drove to Tampa where they met up for a reunion," a source tells E! News. "They also spent a few days at the beach on Anna Maria Island, where Cameron's family has a house. It was a great vacation and they had a blast spending time with Cameron's nieces and nephews."
The couple's five-day trip marks the first known time that Diaz has introduced her boyfriend to her family. "Cameron and Benji are like big kids themselves. They were having a great time jumping over waves and splashing in the water. They were giving the kids piggyback rides and seemed like the best babysitters ever," the source says. Needless to say, Diaz's family loved Madden. "The kids all couldn't wait to hang out with Cameron," the source continues, "and Benji was right there with her having fun."
It wasn't all family all the time, however.
When Diaz and Madden found some alone time, they were "very affectionate," according to the source.
"Cameron was hugging Benji from behind and kissing him whenever there was a free moment. They swam together and went to some of Cameron's favorite local restaurants," the source reveals to E! News. "They seem like they are having fun getting to know each other and taking it to the next level."
Diaz, whose exes include Jared Leto, Alex Rodriguez and Justin Timberlake, "wasn't shy" about showing off her new boyfriend. "He fit in well," the source says of the musician, who previously dated Paris Hilton, Holly Madison and Sophie Monk. "Everyone hung out together for several days and seemed bonded by the end of the trip."