Aubrey Plaza and Michael Cera took commitment to the bit to new extremes when they were dating once upon a time. The Parks and Recreation actress appeared on the "SmartLess" podcast this week, with co-host Jason Bateman asking her about when she dated the Juno actor - a long-ago relationship he'd learned about from his trusty Wikipedia while researching for the episode. Aubrey Plaza and Michael Cera dated for 18 months. By: Universal Pictures "Didn't you guys date for a while?" Bateman asked his guest. "...Yeah?" Plaza responded, seemingly confused as to why that was relevant.