By Leah Ornstein - Breaking Celebrity News Features Editor

On the month anniversary of her wedding, Blake Lively made her big red carpet debut as Mrs. Ryan Reynolds in New York Tuesday night, and boy did she do it in Gossip worthy fashion!

The 25-year-old, who tied the knot with her Green Lantern costar on September 9, hit the Chanel Fine Jewelry 80th anniversary, glamming up in a plunging couture gown and flaunting her enormous engagement ring – and Breaking Celebrity News has the photos.

The new bride, who scored a coveted Chanel contract in January 2011, stunned in a pale pink and silver Chanel Fall 2012 Couturegown, that featured a jeweled centerpiece and chain detailing, which she paired with Christian Louboutin heels and her pale pink Lorraine Schwartz diamond engagement ring. 

Blake and Ryan attended the wedding of Blake’s Sisterhood of the Traveling Pants costar Amber Tambyln to David Cross over the weekend.