I love that the horse got to be on the red carpet to :) Handsome Viggo Mortensen with 1 of 3 horses he's adopted post film wrap. There names are Uraeus, Kenny (from Lord of the Rings: Return of the King), & T., whom he rode in "Hidalgo.
Oh please I've seen male human do this too. Meh girls do it better anyways -- I've got more than one horse who gives it back ten fold! Especially the yearling filly who treats it as the greeting routine.