Jennifer Lopez and Ben Affleck have reached another relationship milestone since rekindling their romance: spending a holiday together. The pair enjoyed the July 4 weekend in the Hamptons. “They were with family and friends and had several activities planned, including beach outings, boating and a BBQ,” a source says. On July 3 the couple arrived with Lopez’s twins, Max and Emme, 13 (whose dad is her ex Marc Anthony), in the exclusive Long Island area, and they got cozy during an afternoon stroll. The day before, Lopez, 51, and Affleck, 48, were on the opposite coast, spending time with her kids and his son Samuel, 9, at Universal Studios Hollywood, where the group went on several rides. “Ben is slowly getting to know her kids, and his son is…
