The 'Fight Club' star reportedly bought a luxurious Patek Philippe Minute Repeater, which normally has a two-year waiting list.
The custom-made timepiece is gold with a mother of pearl dial and takes two months to make.
A source told The Sun newspaper, "Brad decided to buy one of the amazing watches after meeting the Stern family at a watch fair in Basel.
"He wanted to buy Ange a unique gift that very few people own which is like a piece of art - and the highly sophisticated watch is just that."
"It chimes sounds based on Big Ben and is constructed by hand. He went to Geneva to pick it up and it's believed he'll present it to Ange as a pre-wedding gift."
Brad, 48, got engaged in to Angelina, 37, in April and they are expected to marry in a ceremony at their French chateau. The couple is currently living in Surrey with their six children.Check out our videos like the one below - who can resist 'Magic Mike'?