“Hangover” actress Nathalie Fay has been arrested after allegedly punching her on-again, off-again boyfriend in the face in Miami.

The 36-year-old, whose real name is Nathalie Tordion, was nabbed on a domestic battery charge late Saturday after allegedly striking her beau when he went to pick her up from the Miami Dolphins NFL preseason game, TMZ reported.

The Canadian-born actress — best known as the Caesars Palace hotel desk attendant in the first “Hangover” film — is accused of throwing the punch after questioning where her boyfriend had been prior to collecting her.

Fay had allegedly shown her boyfriend, only identified as Brady, a map on her phone that proved he wasn’t where he said he was just moments before striking him.

The boyfriend told cops he then jumped out of the car to get away from her.

The actress-turned-realtor was cuffed when officers arrived, while her flame refused transport to a local hospital.

Fay, who has a string of acting credits to her name, is most memorable for her small role alongside Bradley Cooper in the 2009 flick.

As the Las Vegas hotel’s desk attendant, Fay’s character answered Zach Galifianakis’ character’s question on whether the real Julius Caesar had lived at the casino.

Other comedy classics she’d featured in include “Old School,” “Due Date” and “Blonde and Blonder.”

Her last acting credit was for “Layover” in 2014, according to her IMDb profile.