Duff appeared as a guest on "The Ellen DeGeneres Show" Friday, and explained how she and Comrie, who share custody of their 3-year-old son Luca, remain amiable despite their separation.
"You and Mike, by the way, are really doing it right," DeGeneres said. "You're friends and raising your son [together] and it's very friendly, and I think that's the way it should be."
"We have such a great kid, and we're both so obsessed with him," Duff said. "We are good friends and we laugh a lot, and we have a great communication."
The 28-year-old "Younger" actress also revealed that she and Comrie often "share stories and pictures when one [parent] is not with Luca."
"He's great, we're great, and we keep on trucking," Duff said.
Duff and Comrie married in 2010, and confirmed that they were separating in January 2014.
Watch part of Duff's interview on "Ellen" below: