Acca-believe it! 'Pitch Perfect 3' is coming this Christmas

World champion vocal group The Bellas are getting back together, but this time they have to compete against bands that write original songs and "actually have instruments."

Beca's quit her job, Amy's busking as an Amy Winehouse impersonator, Flo is working a smoothie stand and Chloe's trying to get into vet school.

With the US a capella group trying to find their way after college graduation, there's a chance to get back together and take part in a European concert for troops stationed overseas.

That means overcoming a new challenge when they go up against bands that can play musical instruments and come up with their own material.

"Aww, you guys just sing other peoples' songs," goes the taunt from a rival band.

WATCH the trailer for Pitch Perfect 3

Anna Kendrick, Rebel Wilson, Chrissie Fit, Brittany Snow, Elizabeth Banks, and Hailee Steinfeld are among the returning cast, with Ruby Rose (Orange is the New Black, John Wick 2) onboard as the leader of that competing group.

Banks made her feature-length directorial debut with Pitch Perfect 2 and now has Charlie's Angels on her schedule, so Trish Sie from Step Up All In and three OK GO music videos is coming in to direct from a script by trilogy writer as well as Girlboss and 30 Rock scribe Kay Cannon.

Pitch Perfect 3 will be hitting cinema screen in December.