Sharon Horgan has been spotted shooting on the streets of Temple Bar with Domhnall and Brian Gleeson.
The stars were reportedly filming a short called Dukes Governs in Dublin's city centre on Tuesday night.
In one scene Brian (30) is seen walking with a female companion who beats up a man on the street.
Big brother Domhnall (34) was spotted watching with Catastrophe writer and star Horgan.
The Gleeson brothers have worked together many times. Most recently they appeared in Darren Aronovsky's latest film Mother! which also starred Jennifer Lawrence.
Brian has also performed in two of Domhnall's short films, Noreen, in which their dad Brendan also played a role, and What Will Survive of Us.
In 2014 all three appeared on stage together in The Walworth Farce.
Domhnall also previously worked with Horgan (47) on Catastrophe. He played a role in two episodes of the hit sitcom's third season.