The Oscar-nominated actress picked up the Best Lead Actress award at the event on Friday (February 20) at the Dublin Royal Convention Centre in Dublin, Ireland.
The movie also won the awards for International Film, Best Script, and Best Lead Actor for Paul Mescal.
Other attendees of the event included Cillian Murphy with wife Yvonne McGuinness, Jonathan Rhys Meyers, and Lifetime Achievement Award recipient Ciaran Hinds.
Lola Petticrew accepted Best Lead Actress – TV Drama for Trespasses, Anthony Boyle was there to received Best Lead Actor – TV Drama for House of Guinness, and Alison Oliver accepted the award for Best Supporting Actress – TV Drama for Task.
More celebs who showed up included Tom Cullen, Saipan nominee Steve Coogan, House of Guinness nominees Jack Gleeson and Fionn O’Shea.
Photos: Getty Posted to: Alison Oliver, Anthony Boyle, Ciaran Hinds, Cillian Murphy, Fionn O’Shea, Jack Gleeson, Jessie Buckley, Jonathan Rhys Meyers, Lola Petticrew, Steve Coogan, Tom Cullen, Yvonne McGuinness