Conan O'Brien joined The Irish Tenors for a bit of a singsong in Dublin's Whelan's venue on January 11, 2024.@ConanOBrien, X

Conan O'Brien is well and truly soaking up the best that Ireland has to offer during his visit this week.

The Irish American funnyman was in the famous Dublin pub and venue Whelan's on Thursday night where, of course, he indulged in a bit of a singsong with none other than The Irish Tenors.

"Tonight I sang with The Irish Tenors in Whelan's Pub," O'Brien said on social media on Thursday night.

Ever the jokester, he added: "We did 'Cowboys From Hell' by Pantera."

In reality, O'Brien and The Irish Tenors sang (what else?!) "Danny Boy."

Whelan's shared a clip of O'Brien and The Irish Tenors singing, noting that it was a "privilege" to host them.

The Irish Tenors were impressed with their "fourth tenor," saying that O'Brien "has the chops."

Not surprisingly, O'Brien caused a bit of a stir when he visited Whelan's. He was filmed chatting with some people outside the venue, including the music group Dug:

Despite having the craic in Whelan's on Thursday, O'Brien showed no signs of slowing down on Friday when he shared a snap taken in Dublin of "fairy homes."

Meanwhile, Patrick Kielty teased on Thursday that the famous Irish American was set to make an appearance on RTÉ's "The Late Late Show" on Friday night.

It's unclear how much longer O'Brien will be in Ireland, but he's had a busy schedule this week making stops in Dublin, Galway, Tipperary, and Limerick.

It's believed that he is in Ireland filming for his new travel show "Conan O'Brien Must Go." His previous travel show, "Conan Without Borders," won an Emmy in 2018 in addition to receiving an Emmy nomination the following year. 

O'Brien, a native of Boston, has frequently leaned into his Irish roots throughout his comedic career. In 1999, he filmed a segment in Ireland for "Late Night with Conan O’Brien," which saw him play a clueless American tourist.

O'Brien's ancestors were from Ireland; he once claimed his doctor was stunned to see his DNA showed he was "100% Irish."