Saoirse Ronan was a guest on The Tonight Show this week.
The Oscar nominated Irish actress and host Jimmy Fallon decided to channel a good old fashioned Irish pub lock-in and serenade the audience with a duet of The Pogues classic 'Fairytale of New York'.
The pair enjoyed a pint of Guinness during the sing-along.
Also on the episode, Saoirse chatted about her new film Mary Queen of Scots and Margot Robbie challenged her to do her best Australian accent.
Jimmy tested Saoirse's Bridesmaids Movie Trivia.
Finally, Jimmy and Saoirse Ronan faced Alessia Cara and Anderson .Paak in a competitive game of charades.