The Dublin Minors were celebrating a win when they bumped into the Harry Potter star on the street and invited him back to their house party.
Friendly DanRad joined in on the all-nighter, posing for photographs with the lads and sculling from their trophy cup.
These photos from the party were published on tumblr. "They were all out celebrating and they found Daniel Radcliffe in Dublin at 4am and invited him to a house party with them
and he went with them," wrote the poster.