Representatives for both Affleck and Garner confirmed the marriage to The Associated Press on Thursday.
The publicists, Ken Sunshine and Nicole King, also for the first time confirmed that Garner is pregnant with her first child.
Sunshine and King would not give any other details.
The confirmation came after Us Weekly reported that Affleck, 32, and Garner, 33, were wed Wednesday at the Parrot Cay resort in the Caribbean islands of Turks and Caicos.
The National Enquirer also released photos they claimed showed Garner arriving on the islands.