As MPs in the House of Commons debate and vote on whether to introduce same-sex marriage to England and Wales the openly gay television illusionist has recorded a video message for the Out4Marriage campaign.
In the video message Mr. Brown outlines why he feels MPs should allow same-sex couples to marry.
The Marriage (Same-Sex) Bill is being debated in the House of Commons at the time this article is being written. It is widely expected that the bill will be passed despite some Conservative and Labour MPs voting against it.
Derren Brown is the latest high profile person to record a message for Out4Marriage; others have included Stephen Fry, Richard Branson and girl-group The Saturdays.
Politicians who have recorded video messages include Caroline Lucas, Theresa May, Yvette Cooper, Lynne Featherstone, Jack Straw, Danny Alexander and the MEP Michael Cashman.