Blake Lively and Ryan Reynolds at Warner Bros. Premiere of "Green Lantern" at Grauman's Chinese Theatre on June 15, 2011 in Hollywood, California. Credit: Eric Charbonneau/

Although she walked down the aisle (clad in Marchesa) in South Carolina on Sept. 9, Blake Lively didn't technically become Mrs. Ryan Reynolds until five days later!

Us Weekly has confirmed that the Gossip Girl actress, 25, and her Green Lantern costar, 35, applied for their marriage license in South Carolina's Charleston County Probate Court on Sept. 13.

Leaving their full names (Ryan Rodney Reynolds and Blake Ellender Lively) in the paperwork, the couple of just under one year list their official marriage date as last Friday, Sept. 14.

Marrying at Boone Hall Plantation prior to the signing of that paperwork -- with guests that included Lively's Sisterhood of the Traveling Pants costars Amber Tamblyn, America Ferrera and Alexis Bledel -- the couple "looked ravishing," a source told Us.

Lively was a "creative bride with a clear vision of what she wanted," the source added. She walked down the aisle (strewn with pine needles) as a children's choir crooned "Can't Take My Eyes Off of You."

By Monday, Lively was back on set in NYC shooting Gossip Girl -- keeping her Lorraine Schwartz-designed ring hidden.