ScarJo, cancel your dress-shopping trip to David's Bridal -- Stella Mac's got you covered for your big day.

Scarlett Johansson recently got engaged to her actor beau, Ryan Reynolds, and flashed her rock -- a conspicuous but classy solitaire -- at the Met Costume Gala on May 5. Now, celebrity English designer Stella McCartney has told People magazine: "I'm definitely doing her wedding dress. She doesn't know it yet."

Stella dressed Madonna for her wedding to Guy Ritchie in December 2000, so the girl has credentials. The gown was an ivory silk strapless number with a long train.

We're sure Scarlett, 23, was delighted to hear the news. But the star has no shortage of fans in the fashion world. She wore a haute petticoat by Dolce & Gabbana to the Met ball, and she's also a darling of Marc Jacobs. Decisions, decisions.

We suggest a Scarlett wedding dress design-off, with designers fighting to come up with the sexiest, most glamorous gown. It's a bridezilla's dream come true. Given the recent rash of celeb reality shows, we see this as a fabulous series, unfolding on our TV screens in a giant mashup of A-list fabulosity and the highest style. Oh, the clothes! Oh, the drama! Oh, ScarJo, say you will!

Which designer would you like to create your wedding gown?