The sun is shining, the tables are set and the VIP port-a-potties are standing by. Time to have a wedding!

After days of flurried preparation on their behalf, Ashlee Simpson and Pete Wentz are primed to swap vows later today at the bride's parents' home in Encino, Calif., a little more than a month after announcing their engagement.

Jessica Simpson, who hosted a rehearsal dinner for the couple last night at her Beverly Hills pad, is expected to perform maid-of-honor duties, while her beau, Tony Romo, is expected to be her date. Any other boldface names on the guest list have been kept under wraps, but the sizable tent currently set up in Joe and Tina Simpson's decked-out backyard is going to holding between 150 and 250 people, all of whom received save-the-date notices rather than detailed invitations.

You know, for privacy's sake.