The two will marry Sunday at the Beverly Wilshire Hotel.
"I'm very excited," Jones, 28, tells PEOPLE. “My [5-year-old] daughter Brionne is the flower girl, and she woke up this morning and said, 'We have [a few] days, Mommy, and then I can put on my dress!' "
Before an anticipated intimate gathering of family and friends, Jones will walk down the aisle amid a bridal theme of old-fashioned Hollywood glamour, in black and white.
"Rená Puebla is my planner," Jones says, "and she is based out of L.A., and she planned Oprah’s 50th birthday party. So everything we've done has been over the phone, over the Internet, over the mail, so I have never seen everything all together."
As such, she says, "I am hoping and praying it's going to be fabulous."
Bridal OutfitThe bride herself will wear an Alfred Angelo strapless gown, Neil Lane diamond earrings and crystal encrusted custom-made Stuart Weitzman shoes.
Witnessing the event will be some famous faces from Jones's Idol days. "Basically, I invited everyone I wanted to," she says, ticking off the names of Sanjaya Malakar, Melinda Doolittle, Gina Glocksen and Haley Scarnato.
"Chaka [Khan] is supposed to be there to make an appearance," she also says. "I am very excited about that. It's people that have gone through different things with me."
Post-Idol, Jones spent this past year appearing on Broadway in The Color Purple, demonstrating voice techniques as a coach on MTV's Legally Blonde: The Search for Elle Woods and prepping the Oct. 21 release of her single, "So Glad I’m Me," in anticipation of her first solo CD.
"I am glad to be me," Jones says. "I may not have won American Idol, but I have won because I'm able to provide a better life for me and my daughter and that’s all I've ever wanted."