They kept that quiet!
A source has confirmed to People magazine that the couple, who have been dating for just under a year, exchanged vows on Sunday.
Blake's good friend Florence Welch lent her vocals for the occasion, singing three of her hits at the reception.
The couple first met when working on 2011's The Green Lantern together.
Both stars have kept tight lipped over their relationship since getting together.
The couple recently bought a house together in New York so marriage was clearly always going to be the next step.
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This is the second marriage for Ryan who was previously married to Scarlett Johansson, with the two divorcing in 2010.
Blake had been previously linked to her Gossip Girl co-star Penn Badgely before starting up a romance with Reynolds.
The next year looks to be a busy one for the couple with Ryan set to star in four films while Blake is currently finishing filming for the last series of Gossip Girl.
Ryan's ex wife Scarlett Johansson was spotted last week getting cosy with former flame Jared Leto while at a political rally.