“Happy Easter, everybody! We got this cute little Easter bunny, isn’t he cute?,” the Gone Girl star, 43, captioned the clip with husband David Burtka and 6-year-old twins Harper and Gideon.
In the cute clip, the actor pushes something on the plush doll that turns it into a terrifying bunny with sharp fangs.
Last week, Burtka posted a photo of the twins “getting ready for Easter.”
Last month, the Doogie Howser, M.D. star posted a photo of the twins celebrating St. Patrick’s Day.