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Movie siblings can make or break the believability of a feature film. Cast two actors who can convincingly play family members, and you're in the clear; cast two actors who look nothing alike, and you're in trouble.
Thankfully, "The Five-Year Engagement" falls in the former category. In the film, actresses Emily Blunt and Alison Brie play sisters, and not only do they look alike, but they sound alike too. (This is quite a feat since Blunt is British and Brie is not.)
"I had a great vocal coach here in LA for a few weeks, but when I got out there, Emily became my unofficial vocal coach," Brie said last year to The Insider. "It was more important that we sound alike than me studying a super proper British accent." Mission accomplished, Alison!
In honor of the success of "Five-Year Engagement," HuffPost Entertainment has compiled ten other great sibling pairings from the big screen.
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Will Ferrell & John C. Reilly in 'Step Brothers'
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Scarlett Johansson & Natalie Portman In 'The Other Boleyn Girl'
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Mark Wahlberg & Christian Bale In 'The Fighter'
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Emily Blunt & Amy Adams In 'Sunshine Cleaning'
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Anne Hathaway & Rosemarie DeWitt In 'Rachel Getting Married
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Josh Hutcherson & Mia Wasikowska In 'The Kids Are All Right'
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Cameron Diaz & Toni Collette In 'In Her Shoes'
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Emma Stone & Abigail Breslin In 'Zombieland'
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Tobey Maguire & Jake Gyllenhaal In 'Brothers'
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Arnold Schwarzenegger & Danny DeVito In 'Twins'
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