The Easter Bunny was a figure associated with Easter.
The Twelfth Doctor once sarcastically confused Santa Claus with the Easter Bunny. (TV: Last Christmas) He later warned an unseen audience not to trust the Easter Bunny, and to be suspicious of "free eggs". (WC: Happy Easter from the Doctor)
Behind the scenes
The Easter Bunny was pictured visiting the Doctor's TARDIS at Roath Lock Studios.[1]