Is This Accent Real Or Fake?

That is Andrew Lincoln playing Alan King in the 2003 BBC miniseries "The Canterbury Tales." His American accent might convince you when he's playing Rick Grimes in "The Walking Dead," but he's a Brit through and through!

That is Carey Mulligan playing the bereaved wife of an American soldier in the dark 2009 film "Brothers." Though she's used an American accent in several films like "Drive" and "Shame," she's BAFTA-trained and was born in Westminster, London.

Oh Keanu. How did this accent even happen? In your own wise words, Keanu, we all have to be like...WHOA.

Though lots of people know him as Littlefinger from "Game of Thrones" or Mayor Carcetti in "The Wire," Aiden Gillen spoke in the accent he grew up with in Drumcondra, Ireland for this role as Stuart Allen Jones in "Queer as Folk."

All due respect to Mr. Pacino, but that accent as Cuban refugee Tony Montana in "Scarface" is garbage..."MAIIIIN."

That's David Tennant, who's probably best known for his role as the Tenth Doctor in Doctor Who, in which he spoke with an Estuary English accent. He puts on an American accent in FOX's Gracepoint, but neither of those are the real: His natural voice is a Scottish brogue.

That's Rachel Griffiths, who's found fame in the U.S. with an American accent two times over — first in Six Feet Under, then in Brothers & Sisters. But her natural voice can be heard in the 1994 Australian film Muriel's Wedding.

That's Idris Elba, fooling our ears as Baltimorean drug kingpin Stringer Bell in The Wire. In real life, Elba speaks (and raps, and breaks hearts) with a Cockney accent.

It's Renee Zellweger — the Texan who was so good at masking her American accent, she was allowed to bring the Bridget Jones franchise to life.