Sean Penn will celebrate his fiftieth birthday in Dublin as well as marking his divorce from actress Robin Wright.

The divorce came final this month and Penn, who is in Dublin to film a new movie called 'This Must be the Place,' will turn 50 while there.

He and Wright will share custody of their 16-year-old son Hopper; they also have a 19-year-old daughter, Dylan.

A source told The Evening Herald he is truly enjoying his Irish stint.

"He's here to work and takes every project very seriously, but he's also hoping to have a bit of free time to go to some museums or art galleries while he's here and get a real taste of culture," said an insider.

"He's also looking to mark his 50th birthday in a unique way while he's here in Ireland."

Filming on his the new movie will start on August 16. Co-stars include fellow Academy Award-winner Frances McDormand.

Penn, plays an aging rock star pursuing a Nazi criminal who killed his father is in a concentration camp.

His character is called Cheyenne, a man who lives a quiet life in Dublin with his wife, played by McDormand.

When his father, a holocaust survivor, passes away in New York, he embarks on a journey to track down his father's nemesis.

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