Which stars of the new R-rated comedy film Mike and Dave Need Wedding Dates has the biggest potty mouth?

Not main actors Zac Efron and Adam DeVine, apparently.

"Aubrey has a pretty dirty, a foul tongue," Devine, 32, told E! News' Will Marfuggi about co-star Aubrey Plaza, 31.

"I thought you were going to say me but I don't think that's true," she said.

"I think on the bloopers, you had, you had the most-" Efron, 28, chimed in.

"You brush your teeth with d--k in the morning?" DeVine asked.

Adam DeVine, Zac Efron

Frazer Harrison/Getty Images for Spike TV

The three also star with Anna Kendrick, 30, in Mike and Dave Need Wedding Dates.  Efron and DeVine play party-loving brothers who place an online ad to find dates, played by the actress and Plaza, for their sister's wedding. Hijinks ensue when they meet the ladies, who are even wilder than they are.

Efron showcased his own potty mouth in a video showing them reading from the NSFW book Where Do Brothers Come From?, released to promote Mike and Dave Need Wedding Dates.

The publication contains lines such as "One day it's only you in this Earth, just Mom and Dad and plenty of mirth and then all of a sudden, there is another. They call that f--ker your loving brother" and "He tells dirty jokes and he farts real loud, too. Holy s--t. This guy is just like you!"

Mike and Dave Need Wedding Dates is set for release on July 8.

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