Watch the moment where Saiorse Ronan learned ‘hero’ Kristen Wiig is in ‘Ghostbusters’

PARK CITY, UTAH — Today, the all-lady cast of “Ghostbusters” was announced: Kristen Wiig, Leslie Jones, Kate McKinnon and Melissa McCarthy are the main ghoul-fighting ensemble.

Coincidentally, Kristen Wiig — or, more specifically, her character in “Bridesmaids” — happens to be Saiorse Ronan's favorite “superhero.” So we got to break the good news to her on the same day.

Her “omg” would be an understatement.

Watch a short clip of our interview above. Ronan's at the 2015 Sundance Film Festival for “Brooklyn” and “Stockholm, Pennsylvania.”