On Sunday, June 13, the rekindled flames were joined by Lopez's 13-year-old twins Max and Emme — whom she shares with ex-hubby Marc Anthony — for a party celebrating J.Lo’s sister Lynda Lopez’s 50th birthday.
"They enjoyed a Sunday family dinner together," a Nobu source dished of the "small birthday celebration," where "everyone seemed great and had fun."
The insider squealed that "Jen and Ben sat next to each other and were very affectionate," adding the duo — who called off their 2003 wedding — were holding "hands under the table."
Affleck, who shares three children with ex-wife Jennifer Garner (Violet, 15, Seraphina, 12, and Samuel, 9) didn’t shy away from Lopez’s twins. "Ben and her kids seemed comfortable together," the source told PEOPLE. "The kids kept chatting with Ben. Ben seemed great. He was smiling and laughing. They ordered a lot of food to share.”
It was also noted that “Ben had a Diet Coke," as the Argo director is sober following a long struggle with alcoholism — which he candidly revealed was partially to blame for his divorce from Garner.
Lopez and Affleck reunited in Los Angeles after spending a little time apart. OK! learned the Batman star was spotted last week filming during a night out with the Maid in Manhattan star’s mother, Guadalupe Rodriguez, at a Las Vegas casino.
The 75-year-old mother and grandmother joined her daughter's boyfriend on Wednesday, June 9, at the Wynn resort, where it's being said that the seasoned Hollywood star is directing and filming a new project.
Affleck also gambled with his possibly future mother-in-law while in Sin City — the two are both famously good gamblers.
The Selena star's mother has been described by her daughter as "a huge gambler” and once "won $2.4 million at an Atlantic City casino." The Pearl Harbor alum has also been known to love hitting the blackjack table. Seven years ago, the director was "banned from gambling at the Hard Rock in Vegas because security officers had caught him counting cards."