Actor Gerard Butler helped to surprise a bride-to-be by crashing her bachelorette party in Sydney, Australia over the weekend (15-16Mar14).

Maja Nogic was celebrating her impending nuptials on Friday (14Mar14) when the 300 star climbed aboard a yacht she had rented for the party.

Her pal Draana Ogorelica says, "We thought it was a stripper, because it was a hen's party. But then we saw (Gerard) standing on the boat.

"We all just started screaming. His accent, oh my goodness, it was so beautiful. You couldn't understand him half the time, but you didn't care because it was just gorgeous. (He said to us), 'Is this a hen's party? Can I join? We're going to dance a little bit, drink a little bit'."

The actor reportedly told the bride-to-be that her future husband was "a really lucky guy".

Photos of the hunk and the girls, taken by Ogorelica, have hit the Internet.

Butler is in Sydney preparing to start work on new movie Gods of Egypt, which also features Geoffrey Rush and Nikolaj Coster-Waldau.

Reports suggest he had hired the boat to look at properties on Rushcutter’s Bay and was just wrapping up his house hunt as the hen party began.