Blake Lively and Ryan Reynolds reportedly planned their wedding like a "top-secret military operation".

The two stars are thought to have tied the knot in South Carolina on Sunday. The wedding speculation has shocked many as the pair had only been dating for around a year.

Although there has been no official confirmation, it's been claimed they exchanged vows at Boone Hall Plantation in Mount Pleasant, where romantic movie The Notebook was filmed.

The couple are thought to have gone to great lengths to ensure their special day remained private.

"[It] was orchestrated like a top-secret military operation,' revealed a source close to the couple Monday," to Chicago Sun-Times.

"This couple treasures their privacy with an intensity that is pretty strong even compared to other privacy-starved stars in Hollywood," a movie executive added.

It's reported Blake and Ryan used pseudonyms when planning their nuptials. Many of the people deeply involved with the organisation didn't even realise who was tying the knot. Anyone who did have the information signed an agreement to ensure nothing was leaked.

While it is Blake's first marriage, Ryan was previously wed to Scarlett Johansson. She is understood to have sent her congratulations to her ex-husband.