Today the USPS revealed the design for the 2013 "Yes I Do" Stamp, as part of their wedding series of stamps. The stamp will be 66-cents in value (the two ounce domestic rate) designed for oversized and heavier wedding invitations and the like:

Here's the official announcement:
Quote:
Though seemingly small, these three words hold enormous meaning, marking the beginning of two lives joined together in love. The Yes, I Do stamp is a charming and romantic addition to the U.S. Postal Service's Weddings series, adding a festive yet elegant flair to wedding correspondence.
With the words "Yes, I Do" nestled in a colorful bouquet of stylized flowers in the shape of a heart, this stamp is sure to add a touch of beauty to wedding invitations. The stamp will be issued at the two-ounce mailing rate to accommodate the heavier weight of an invitation, as well as other mailings such as oversized cards or small gifts that require extra postage.
Designed by art director Ethel Kessler, Yes, I Do features the work of graphic artist Michael Osborne.
The Yes, I Do stamps are being issued in self-adhesive sheets of 20 at the 2-ounce rate.