In addition to Karlie -- who will also serve as an executive producer -- and Christian, the Project Runway revival will also feature the following judges: Returning judge and ELLE editor-in-chief Nina Garcia as well as newcomers Brandon Maxwell, a fashion designer, and Elaine Welteroth, a journalist and former TeenVogue editor-in-chief.
"As someone who grew up watching Project Runway, I could not be more excited to host and produce a series that provides a platform to aspiring American designers as they pursue their creative and entrepreneurial dreams," Karlie said in a statement.
"I am equally as thrilled to work alongside an incredibly talented group of fashion innovators -- Brandon Maxwell, Elaine Welteroth, Nina Garcia and Christian Siriano -- to inspire, support and help guide these designers as they realize their visions and build everlasting brands and businesses."
The series is currently in pre-production and will premiere in 2019.
And Christian said of Project Runway's revival, "[The show] has offered such wonderful opportunities for so many and I'm excited to take on this role as a mentor. I hope to guide and inspire the new talent on the rise."
Bravo executive Shari Levine called the new team "trailblazers with tremendous reach inside and outside the fashion industry," who will "reenergize the franchise" along with Bravo and its producing partners, Magical Elves and Lantern Entertainment.