Staff were left stunned by the jaw-dropping tip.

The American singer hit the town before his three-night run at Phoenix Park, and it seems he left an extremely generous tip in one particular pub.

The Something in the Orange singer named The Celt on Talbot Street his favourite pub in the country and backed up his claim by leaving a whopping €6,000 tip.

Taking to his Instagram story, Bryan posted: “Shout out to the Celt last night, best damn bar in Ireland."

Publican and owner of The Celt, Noel Tynan, revealed the country star gave three bar staff a total €6,000 tip after hearing one of them say they were working late night to pay their college fees.

“Zach was at the counter talking to staff and one of them said he was a student.

“He was asking why he was working so late and he said he was doing it to get a few bob for college. ‘Maybe I’ll help you,'" revealed Tynan.

“So he left a tip of €6,000 for the three of them and said, ‘That’s his fees paid for now.’ He also gave me tickets for a couple of terminally ill children from Crumlin Hospital to attend the show tonight.

“Zach is the most down-to-earth young fella you’ll ever meet. He first came here two years ago when he played a couple of nights at The Helix," he added.

Seems like his tips are like his lyrics, heartfelt and above average!