Project Runway is enlisting some A-list talent for their big finale!

E! News has an exclusive sneak peek at next week's part two of the Project Runway season 18 finale, which welcomes celebrity guest judge Serena Williams to the stylish panel (part one airs tonight at 9 p.m.).

The preview gives fans a first look at host Karlie Kloss introducing, "the greatest tennis player of all time, creator of her own line S by Serena and all around revolutionary woman, Serena Williams," before the final four designers Victoria Cocieru, Sergio Guadarrama, Geoffrey Mac and Nancy Volpe-Beringer show their collections on the runway.

"Our designers have been waiting for this day their entire careers," Karlie adds. "We appreciate you all joining us today to help celebrate their dedication and their beautiful work."

Williams will of course be joining judges Brandon Maxwell, Nina Garcia and Elaine Welteroth and mentor Christian Siriano for the exciting finale.

Other celebs who have appeared as guest judges this past season included Rachel Brosnahan, Cyndi Lauper, Leslie Jones, Lindsay Vonn, Kiernan Shipka and Laverne Cox.

Don't miss the Project Runway two-part finale tonight and Thursday Mar. 12 at 9 p.m.!

(E! and Bravo are both part of the NBCUniversal family)

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