The Selena star rocked a floor-length Gucci gown featuring a black zip-up bodice and tan-skirt as she cozied up to the Good Will Hunting alum who wore a monochromatic black suit for the night out.
As cameras flashed the married duo — who wed twice last year — shared a kiss and packed on the PDA as they made their way down the carpet together.
"Jen and J.Lo have since been able to resolve their differences, for the most part," the insider explained. "They realized they had no choice but to bury the hatchet."
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The "On The Floor" singer and the 13 Going on 30 actress were reportedly at odds after Garner made an interesting public statement about keeping her family members out of the media after Affleck's infamous appearance at the 2023 Grammys with his new spouse.
"It's Jennifer's way of saying Ben looks miserable and all his appearances in public are lame. How could J.Lo not take it personally?" the insider explained. "Part of her wants to fire back and tell Jennifer off, but she's smart enough not to make too much of a scene publicly. So it'll be up to Ben to play referee."
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"It's Ben's worst nightmare. It's just a matter of time before those two women butt heads," the source spilled of Lopez and Garner — whom he was married to from 2005 until they officially divorced in 2018.