Actor Michael B. Jordan, left, sometimes gets confused with TV host Nick Cannon. Jordan, 28, plays a boxer in the upcoming "Creed," a "Rocky" spinoff, while Cannon, 34, was famously married to singer Mariah Carey. Click through the gallery for more interchangeable celebs; some look alike while others are just mistaken for one another because of similar backgrounds or personas.
Spanish actor Javier Bardem, left, has been richly rewarded for serious roles in films such as "The Sea Inside" and "No Country for Old Men." Television and film actor Jeffrey Dean Morgan could probably stand in Bardem's place to accept one of those awards, and nobody would be the wiser. Eerie, right?
With their blue eyes and dark hair, actress-singer Zooey Deschanel, left, and pop star Katy Perry are dead ringers. Honorable mention in this lookalike competition goes to actresses Alexis Bledel and Fairuza Balk.
It's not so much the dark good looks that trip up observers of actors Dylan McDermott, left, and Dermot Mulroney but those similar Irish-sounding names. Say them three times, fast!
Compact yet powerful actors Joe Pesci, left, and Harvey Keitel both have a penchant for playing heavies. Pesci stole his scenes in "My Cousin Vinnie" and "GoodFellas," while Keitel smoldered in "Mean Streets," "Wise Guys" and "Pulp Fiction." Both actors have worked with director Martin Scorsese.
Keira Knightley, left, was cast as a stand-in for Natalie Portman's Queen Amidala in "Star Wars: Episode I" because of their close resemblance.
Howard and Chastain aren't the only Hollywood redheads who have people scratching their heads. Academy Award-nominated actress Amy Adams, left, looks a lot like comedic actress Isla Fisher.
Matt Damon, left, and Mark Wahlberg both grew up around Boston and have played up Southie accents for film roles.
"Harry Potter" actor Daniel Radcliffe, left, and hobbit Elijah Wood have elfin good looks that can make the guys hard to distinguish from one another.
As their long careers in Hollywood continue, actors Gary Busey, left, and Nick Nolte are obviously becoming the same person.
Actor Skeet Ulrich, left, was often deemed "the poor man's Johnny Depp" when he first appeared on the scene. Ulrich has achieved career traction with TV roles on "Jericho" and "Law & Order."
Helen Hunt, left, was a teen actress herself, but she seemed to be reincarnated when a young Leelee Sobieski began acting in the '90s.