Chris O’Dowd shocked fans with an impromptu sing-along performance at a bar in London.

The “Bridesmaids” star, 46, belted out the traditional Irish song, “The Rattlin’ Bog,” at the pub in the Irish London Centre’s Instagram video shared last week.

O’Dowd, who was surrounded by a group of friends and his wife, Dawn O’Porter, held a beer in his hand as he expertly sang every word to the song.

At one point, O’Porter, who was wearing a black floral dress, stood up and danced with her hands in the air.

Other people in the bar, meanwhile, happily joined in on O’Dowd’s performance.,

The Irish actor wore a tan jacket over a white shirt and a pair of blue jeans.

The Irish London Centre captioned the video, “‘I never see you at the club. ‘I never see you at the London Irish Centre, screaming the ‘Rattlin Bog’ with Primetime Emmy Award winner Chris O’Dowd?’”

Fans reacted to the joyous footage of O’Dowd in the comments section.

“He’s a legend,” one fan wrote.

“How does it feel to be living our dream?” another fan asked.

A third person joked, “You can take the man out of Ireland…”

A different fan gushed that O’Dowd and his wife “are adorable together.”

O’Dowd was born in Boyle, a town in County Roscommon, Ireland. He studied at the University College Dublin before moving to England to attend the London Academy of Music and Dramatic Art.

He rose to fame starring in the British comedy series “The It Crowd,” which aired from 2006 to 2010.

O’Dowd’s most famous American projects include the films “Bridesmaids,” “This is 40,” “St. Vincent” and “Molly’s Game.”

He also had a recurring role in “Girls” as as Jessa’s (Jemima Kirke) impromptu husband, Thomas-John.

Since 2012, O’Dowd has been married to Porter, a Scottish writer, director and TV presenter.

The couple share two sons, Art, 10, and Valentine, 7.

After moving out of Los Angeles in 2024, the family has split time between London and Margate, a seaside town in Kent.

In 2022, O’Porter told The Independent what she thinks is “the secret of a good marriage.”

“Don’t expect it to be perfect all the time. That took me a long time to learn,” she stated.

“Sometimes, it will be stressful and hard, but as long as the majority of the time it’s not, I think you’re doing pretty well,” O’Porter added.