"American Idol" season one alum Jim Verraros and partner Bill Brennen will marry Sunday evening in an outdoor ceremony in Oak Brook, Ill. -- and "Extra" has all the details!

The wedding's theme will be old Hollywood and vintage glamour and the happy couple will wear tuxedos by Zegna and Tom Ford bow ties. The bridesmaids will don gowns from the Love by Enzoani Collection.

The 220 guests will enjoy multiple courses followed by a six-tier wedding cake with vanilla, custard and passion fruit.

Jim and Bill met via MySpace and have been together for four years. Same-sex marriage is not recognized in Illinois, but Verraros says, "We love each other and want to get married." He adds, "We want to have some sort of ceremony to show our friends and family how beautiful and traditional it can be. We'll also be going to Iowa later to make it legal."

Jim didn't leave his singing career behind after his time on "American Idol." He's working on a new album and recently released two new singles on iTunes.