Aww, these pics are making us melt!

On Friday Hilary Duff took her adorable son Luca to a park in Los Angeles, and we're not sure who had more fun when the two were playing on the swing set -- Hil or her little man!

Hilary and estranged hubby Mike Comrie haven't been seen together in a while, last we checked it seemed like the two were trying to give things another go. "I mean, if there wasn't a chance for getting back [together], I think we would've filed for divorce," the star told The Kyle and Jackie O Show back in September. A month after that, Hil and Mike attended a Halloween party in Hollywood, and in November she revealed that she was seeing a therapist, though it wasn't clear how often he was joining her.