Actor Brad Pitt will be George Clooney's best man at his wedding.

The `Monuments Men` actor is set to tie the knot with girlfriend Amal Alamuddin later this year, and his aunt Starla thinks his `Burn After Reading` co-star will be by his side at the ceremony, reports contactmusic.com.

''I would say he'd choose Brad Pitt for his best man. They are good friends, I would think that's who he'd choose,` said Starla.

Starla also revealed her nephew is set to marry the 36-year-old lawyer in Italy, with his parents Nick and Nina Clooney planning a trip to Europe to help with the wedding preparations for his big day.

''I did hear Cincinnati, since it's not that far from Kentucky - that's one of the places they were considering - but apparently Cincinnati didn't win, it's not going to be the place. I do know that Nick and Nina are planning a trip over to Italy in the next week or so to, I guess, scope out some stuff,` she said.