Brad Pitt is among those Hollywood stars who has always made headlines whenever he has changed his hairstyle and of recently he has dyed his hair grey for his upcoming movie, "War Machine."

According to E! Online, "Moneyball" star was spotted on set in London sporting grey hair and the 'rugged soldier' look in his grey army camos and combat boots to compliment his role in upcoming "War Machine."

Netflix's satirical comedy is inspired by Michael Hastings' memoir, "The Operators: The Wild and Terrifying Inside Story of America's War in Afghanistan." In the film, Brad Pitt's role has been inspired after Stanley McChrystal, the controversial general who commanded U.S. armed forces in Afghanistan.

According to Us Magazine, the 51-years-old Brad Pitt will next be seen on the big screen in "By The Sea," in which he costars with Angelina Jolie. The couple has earlier worked in "Mr. & Mrs. Smith," and after almost a decade, they have reunited for "By The Sea." In an interview with Vogue, Angelina Jolie said that "By The Sea" is not an autobiographical film. "Brad and I have our issues... but if the characters were even remotely close to our problems, we couldn't have made the film."

George Clooney who started his career as a brunette dyed his hair grey for his films like "The Three Kings," "The Perfect Storm," and "Ocean's Eleven." Now, with Brad Pitt grey dyed hair, the "Se7en" movie star looks like a silver fox.

Recently online tabloids had accused Brad Pitt for having an affair with Sienna Miller, but even Sienna Miller has declined all the rumours. On the London set, Brad was spotted with his youngest children, 7-year-old twins Knox and Vivienne. So, with the recent pictures it looks like, everything is going well between Angelina Jolie and Brad Pitt.