Wedding Site: Cabo
A destination wedding in Baja? So chill.
Maid of Honor: It's a no-brainer! Jessica is super-tight with her baby sis, Ashlee.
Bridesmaid: Texan CaCee Cobb is Jess's BFF and former personal assistant.
Ring Bearer: The singer dotes on Ashlee's 3-year-old son, Bronx Mowgli.
John Mayer: Jessica's ex infa-mously told Playboy she was "sexual napalm." Awkward!
Carrie Underwood: They share an ex, Tony Romo, and Jess once wore a "real girls eat meat" tee as a disto vegetarian Carrie.
Ken Paves: She and her stylist were inseparable—until he, um, cut her off last year.