Jen & John: ULTIMATUM!

TIT FOR TAT? JUST ONE WEEK AFTER JENNIFER GARNER WAS SPOTTED SNUGGLING WITH EX-HUSBAND BEN AFFLECK, HER BOYFRIEND, JOHN MILLER, STEPPED OUT WITH HIS FORMER WIFE.

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JEN GARNER and Ben Affleck looked quite cozy while attending their son Samuel’s 13th birthday party at the Combat Paintball Park just outside of L.A. on March 2. At one point, the former couple — who split in 2015 — were seen walking side by side as Ben laughed animatedly; at another, Ben was spotted affectionately putting his arms around Jen’s waist as she fired her paintball rifle. Their physicality drew speculation that things weren’t over between the two, especially in the wake of Ben’s much-publicized divorce from Jennifer Lopez, which was finalized in January. Jen G’s boyfriend of seven years, businessman John Miller, wasn’t immune to the buzz, a source told Star days after the paintball outing. “No one would blame John for making Jen choose,” added the insider, warning, “but any ultimatum could only lead to heartbreak.”

Yet just one week later, the Cali Group and PopID CEO seemed to be offering his own challenge. On March 9, John reportedly skipped his usual weekend date night with Jennifer. Instead, the 47-year-old was spotted hanging out with his ex-wife and mom to his two kids, violinist Caroline Campbell, in L.A. The two then got into a car together and departed for an unknown destination. “A lot of people think John was sending Jen a message by being seen with Caroline,” a source tells