Nailing an accent is crucial for an actor. If done right, it can enhance both the performance and the film in truly memorable ways. These 12 actors can change their dialects so well, you hardly remember where they're from.

Christian Bale

Bale is one of those British actors that you would hardly recognize in his native tongue. From Batman's raspy growl to Irving Rosenfield's Jersey accent in 'American Hustle,' Bale is a true chameleon when disguising his voice.

Rose Byrne

The 'Bridesmaids' star predominately uses an American accent in most of her Hollywood films, but this summer's 'Neighbors' gave us a chance to hear her native Aussie accent.

Daniel Day-Lewis

Mr. Day-Lewis is a master of many roles. He can transform both his voice and his entire personality to fit any character he takes on. This is probably why he has won the Oscar for Best Actor three times.

Carey Mulligan

This Brit's breakout role was as an English school girl in 'An Education,' but she gave an American accent a shot in 'Drive.' She then went on to play all-American Daisy opposite DiCaprio in 'The Great Gatsby.'

Leonardo DiCaprio

From South African in 'Blood Diamond,' to south Boston in 'The Departed,' Leo's proven to be quite capable with the accents. Especially in the sadistic role of a southern slave owner in 'Django Unchained.'

Sacha Baron Cohen

Whether it's Ali G, Borat or Bruno, Cohen manages to surprise (and offend) audiences everywhere. What's most terrifying is that you never know what he'll do next.

Gwyneth Paltrow

Gwynnie has spent a lot of her adult life living in London, and she could most likely be mistaken for a Brit -- her accent in films like 'Emma' is just that good.

Meryl Streep

This multiple Oscar winner has mastered many accents throughout her career, most recently as British Prime Minister Margaret Thatcher in 'The Iron Lady' and as a southern matriach in 'August: Osage County.'

Kate Winslet

Winslet can do an American accent better than most American actresses. It's so crystal clear that you almost forget she's British. She even mastered German in 'The Reader.'

Helen Mirren

Dame Helen is so good with accents that she won an Academy Award for her role as Queen Elizabeth II in 'The Queen.' In the upcoming film, 'The Hundred-Foot Journey,' the Oscar-winner shows off a French accent.