Colin's brother Eamon is gay and happily married living in Canada so the actor felt it only right that he would lend his support to the proposal in Ireland.
Fair play to the bloke, he spoke very eloquently on the topic and even got the attention of one Ellen DeGeneres, who tweeted below...
Colin Farrell explains his support for marriage equality in a beautiful way. I couldn’t have said it better myself. http://t.co/dWt9hIWrgh
— Ellen DeGeneres (@TheEllenShow) January 20, 2015