The movie will take place on Anna's birthday when Elsa and Kristoff set out to throw her the best party of all time, "but Elsa's icy powers may put more than just the party at risk," the studio teases.
Directors Chris Buck and Jennifer Lee will return along with producer Peter Del Becho and songwriters Kristen Anderson-Lopez and Robert Lopez. As of now, it hasn't been confirmed whether Kristen Bell, Josh Gad, Jonathan Groff and Idina Menzel will reprise their roles.
While you wait for Frozen Fever, you can catch Anna and Elsa on ABC's Once Upon a Time when it returns Sept. 28 at 8/7c.
Whoa! See where the cast of Blossom is now: