Getty Images

Separated at birth? Long-lost twins? Vague coincidence? It's all possible when actors look so alike they could be siblings.

Is that Zachary Quinto, the Chief Science Officer of "Star Trek Into Darkness," running from the horror of "Aftershock"? Ah, no, at second glance, that's actually Quinto's doppelganger, Eli Roth, the man who gave us "Cabin Fever" and shot Hitler full o' holes in "Inglourious Basterds."

Anyway, with "Aftershock" and the new "Trek" being released back-to-back, we figured this was the perfect time to match up our favorite Hollywood doubles as they compete for roles, attention and DNA. It's like looking into a mirror!

If you think your eyes are starting to play tricks on you, think of this like that Olsen Twins movie "It Takes Two," but without Steve Guttenberg.

Leighton Meester & Minka Kelly

Luscious "Gossip Girl" star Meester might be "Country Strong," but she more than met her match in Minka Kelly, who shone on "Friday Night Lights" as the lovely Lyla Garrity. The two of them actually got to face off, "Single White Female"-style, in 2011's horror thriller "The Roommate," when they entered freshman orientation together — but only one came out alive. Easy, ladies!

Getty Images

Logan Marshall-Green & Tom Hardy

After the one-three punch of "Bronson," "Inception" and "Warrior," Tom Hardy was the hunk du jour in Hollywood, but now a nearly identical upstart is nipping at his heels. After treading the boards Off- (and occasionally Off-Off-) Broadway, relative newcomer (and NextFactor highlight) Logan Marshall-Green began wriggling his way to the big time last summer via Ridley Scott's "Prometheus." Of course, Hardy's Bane in "The Dark Knight Rises" could probably throat-punch an alien to death with his eyes closed.

Getty Images

Carey Mulligan & Michelle Williams

It's all about the gorgeous swan-like necks. Carey and Michelle could not be more different as actors; the former has an old-school, boisterous lightness while the latter, in both real life and on film, is introspective, reserved, even ethereal. We almost did a double-take in 2011 when Mulligan was seen on screen with Williams' "Blue Valentine" sweetheart Ryan Gosling in "Drive."

Getty Images

Javier Bardem & Jeffrey Dean Morgan

In their signature roles as Anton Chigurh in "No Country For Old Men" and The Comedian in "Watchmen," respectively, Bardem and Morgan pull off striking, bull-in-a-china-shop characters whose moral compasses have long since been flushed down the toilet. Oddly, strewn across their paths of destruction we find very real human fragments to latch onto ... and that's not on the page, it's in the performances. Still, we wouldn't want to run into either of these tough customers in a dark alley.

Getty Images

Josh Duhamel & Timothy Olyphant

These doppelgangers have yet to cross paths on screen, but when they do, it's sure to be electric. Olyphant first captured our attention as the lead in HBO's foulmouthed fan-favorite "Deadwood," then graduated to playing men of dubious intent in flicks like "Live Free or Die Hard." Duhamel is more the average all-American Joe type, playing a soldier for the "Transformers" trilogy and romantic leads in fluff like "Safe Haven." Does the U.S. Marshal on "Justified" need a half-brother?

Getty Images

Teresa Palmer & Kristen Stewart

Palmer has nearly nabbed roles in "Justice League," "Mad Max" and the "Spider-Man" movies, but this talented blonde will forever be in the shadow of her movie duplicate, Kristen Stewart. Despite different hair, they share a shocking resemblance. Palmer may be catching up to Stewart, though, as she recently starred as a human who swoons over a member of the undead (a zombie this time, in "Warm Bodies").

Getty Images

Penélope Cruz & Paz Vega

When you first saw "Spanglish" (if you did at all), you might have been wondering how they decided to pair Penélope Cruz with Adam Sandler, of all people. Well, after careful examination of the credits, turns out it wasn't Cruz at all — *SHOCK* — but another gorgeous Spanish actress, Paz Vega. Only two years apart, these two need to get Pedro Almodóvar to write a movie where they're sisters, pronto. C'mon, Pedro, maybe sisters with a gay transvestite mother, hmm?

Getty Images

Michael Cera & Jesse Eisenberg

When did nerds stop seeking revenge on their jock oppressors and start warring amongst each other? Okay, so technically these two haven't directly engaged in combat, verbal or Thunderdome-style ... but there are still many who believe that when it comes to Cera & Eisenberg, two men enter, one man leaves. Despite the current Jesse-positive climate thanks to that little "The Social Network" movie and the upcoming "Now You See Me," these are both super-young dudes with plenty of awkwardness left to give.

Getty Images

Chris Hemsworth & Chris Pine

Playing father and son in 2009's "Star Trek" may have tipped these two Chrises off that they kinda sorta look alike. Hemsworth made his film debut playing James T. Kirk's ill-fated papa George for a scant few minutes, but it gave him the oomph he needed to impress the Marvel brass to pin him as The God of Freakin' Thunder, "Thor." Pine had to delicately dance around the iconic Shatner characterizations to make the Starship Enterprise his own, but he did, and has been unstoppable ever since.

Getty Images

Zachary Quinto & Eli Roth

Pine's pointy-eared shipmate Spock was almost always a lock for Quinto, whom fans immediately pegged as a dead-on lookalike for Leonard Nimoy after he made his name on "Heroes." But Zachary also resembles our favorite bloodthirsty writer-director Eli Roth. When he's not hanging out in cabins or hostels, Roth occasionally moonlights on-screen for pals like Quentin Tarantino, for whom he relished machine-gunning Hitler in "Inglourious Basterds."

Getty Images

Zooey Deschanel & Katy Perry

Now that Katy Perry is acting (she played super-hot Smurfette in "The Smurfs") and divorced from a famous husband, there may literally be nothing that separates her from her big-eyed mirror-image, Zooey Deschanel. Though Perry may be the bigger musical superstar for now, the swoon-worthy "New Girl" has been known to belt it out when she performs as one-half of She & Him, so watch out, Katy.

Getty Images

Alan Cumming & Paul Reubens

And speaking of Smurfs, we finally found two fellas who have come to terms with their lookalike status by agreeing to be in the same movie. In "The Smurfs" Reubens played the gag-gifting Jokey Smurf, while Cumming portrayed the newest character, Gutsy Smurf. Although these were voice-only roles, it was only a matter of time before these two get together for realsies (like they did at the "Pee-Wee" premiere on Broadway). Maybe if the show reopens, Cumming could appear as the depressive younger brother, WeePee Herman, who cries a lot?

Getty Images

Originally published February 2, 2011.

Getty Images

James McAvoy and Jamie Bell are preparing for extreme depravity as they take on the lead roles in the adaptation of Irvine Welsh's underground novel, "Filth," according to The Playlist.

"Filth" follows the misadventures of Bruce Robertson (McAvoy), a sex-obsessed, drug-addicted and bigoted Scottish police officer whose latest murder investigation is continually sidetracked by his own bizarre and subversive shenanigans.

Robertson is (somewhat) watched over by his sidekick of sorts, Ray Lennox (Bell), and his boss, Bob Toal (Alan Cumming).

Sounds like a tale from the man who brought us "Trainspotting," for sure!

The long-gestating project, which has been through a constantly revolving door of different producers and directors over the past few years, looks to be finally coming together with Welsh on board as a co-producer and Jon S. Baird ("Cass") set to direct. Filming will commence in Jan. 2012.

James McAvoy will next be seen (heard) as the voice of the title role in the animated feature, "Arthur Christmas," opening Nov. 23. He's currently filming the crime thriller, "Welcome to the Punch," and will appear in Danny Boyle's art heist movie, "Trance."

Jamie Bell was recently seen in "Jane Eyre" and "The Eagle" and will next be seen in the title role of Steven Spielberg's "The Adventures of Tintin," opening Dec. 23.