According to an onlooker, the pair spent most of their time at the film premiere's after party -- held at Hollywood's Lure nightclub -- chatting as cameras snapped their photo together.
"Ashley smiled the whole time while talking to Gerard," the source tell Us Weekly.
Judd and Franchitti, 39, announced their decision to split in late January, telling Us in a statement that they would "always be family."
"We'll always be family and continue to cherish our relationship based on the special love, integrity, and respect we have always enjoyed," said the couple, who do not have children together.
Earlier in the evening, Judd was letting sister Wynonna Judd, 48, take the spotlight in her debut performance on the premiere of Dancing With the Stars.
At one point following Wynonna's performance, their mother Naomi frantically motioned to the TV audience to call in to vote for Wynonna, even reaching over to encourage Ashley to do the same.
"What a busy night," the actress tweeted during her busy Monday. "Saw #VoteWynonna do BEAUTFULLY on #dwts & now we dash to #OlympusHasFallen premiere! Not a typical night but a fun one."
This article originally appeared on Usmagazine.com: Ashley Judd Wows in Figure-Hugging, Low-Cut Dress on Red Carpet Just Weeks After Split From Husband Dario Franchitti