Hilary Duff Holds Hands With Estranged Husband Mike Comrie

— -- Could they be getting back together?

Nine months after Hilary Duff and Mike Comrie announced their separation, the two attended a costume party holding hands.

This past August, Duff, 27, who has a 2-year-old son, Luca, with her ex, said that she and Comrie are still trying to figure out how to navigate their relationship.

"We love each other so much and we love spending time together. So when you see us out it's not just for Luca, it's because we make plans and we hang out," the "Chasing Sun" singer explained. "We don't know what our future looks like right now, but we're both doing really good and just figuring out what makes us happy."

Regardless of whether they get back together, Duff said that the two remain "really good friends."

"We have so much respect for each other," she said in August, "and obviously, Luca is our number one priority."