Credit: Arnold Turner/WireImage

When Heidi Klum and Seal renew their wedding vows again this year, party attendees will have to adhere to a very strict dress code.

"It's going to be all brides and all grooms," Klum told E! News. "All of the women will be brides and all of the men will be grooms."

The supermodel and Project Runway host didn't offer much of an explanation. "Just one day, I woke up and I was like, 'Oh, I know what I am going to do this year'...I like to have fun and I like to make it fun for my family and friends."

Klum, 36, wed Seal, 47, on May 10, 2005, and the couple have made a tradition of renewing their vows in a big way: in 2009, they threw a "white trash" renewal ceremony, in which Klum's hair was in cornrows, her singer husband sported a mullet, and the officiant was dressed as Elvis Presley.

Last October, Klum gave birth to her third child with Seal, daughter Lou Solola Samuel; her eldest daughter Leni (whose biological father is Klum's ex Flavio Briatore), 5, was adopted by Seal last year.

In November, it was announced that Klum had legally taken Seal's surname, Samuel. (She hasn't yet used it professionally.)