Nearly two years after announcing they were going their separate ways, Will Arnett and Amy Poehler are making their split official. Arnett filed for divorce last week, according to GossipCop. The comic is reportedly seeking joint custody of the couple's kids, Archie, 6, and Abel, 3. Since calling it quits with his former "Saturday Night Live" costar, Arnett has been rumored to be dating Katie Lee. Poehler didn't stay single too long either -- she's currently in a relationship with comedian Nick Kroll.