The 43-year-old actress modeled bridal looks and shared her plans for the ceremony for the magazine's Fall Style issue. Vergara and Manganiello got engaged in December 2014, and will reportedly marry in November.
"I am so excited to announce that I am @martha_weddings cover girl!" the star captioned a photo of her fiancé with the issue Sunday on Instagram. "Pick up a copy and check out these beautiful big-day looks! #MSWeddingsSofia @covergirl."
Vergara told the publication she wants a "wedding where the guests are going to have fun," and said the "important" thing is to create "memories that you're always going to cherish." Her beauty look for the ceremony will take two hours, and she intends to wear her fragrance Sofia because "Joe loves it!"
"Cake is my favorite thing," she also shared. "So the cake table is going to be super special, a big wedding cake and lots of desserts."
Vergara last appeared in Hot Pursuit with Reese Witherspoon, and will return for Modern Family season 7 come Sept. 23. Manganiello, meanwhile, is scheduled for the sports drama Stano and Pee-wee's Big Holiday with Paul Reubens.