In addition to shopping, Lopez and her boyfriend of over a year brought the birthday boy and girl to Planet Dailies to have some pizza for lunch, E! News reports. After, they visited Dylan's candy bar for dessert.
Lopez shares custody of the twins with estranged husband Marc Anthony. The two split in July 2011, and Anthony, 44, filed for divorce in April 2012. The divorce, however, has yet to be finalized.
Lopez recently told USA Today that their kids "didn't know anything" about their separation at first. "They're starting to figure it out now, a year and a half later," she said. "They were just 3 at the time."