Ready to do some double takes? 

Because, sometimes, when it comes to stars like Bryce Dallas Howard and Jessica Chastain, we're not toally sure whow we're lookign at. And we're not alone. In fact, Bryce's famous dad Ron Howard even once mistook Jessica for his own daughter on a red carpet. It happens!

Those two are far from the only Hollywood pair to be considered doppelgängers, just ask Nina Dobrev and Victoria Justice. Plus, a fan has mixed up Reese Witherspoon and Carrie Underwood, while Isla Fisher once cut and pasted Amy Adams' face over hers for her family's holiday card. Oh, and then there was that time Katy Perry decided to play into the uncanny resemblance between her and Zooey Deschanel.

So, let's put some stars side-by-side to see just how similar they look (and manifest) some new projects in which they could play siblings.

We'll take a buddy comedy starring Daniel Radcliffe and Elijah Wood ASAP, please!

As the Harry Potter alum has even confessed, "Though we are both short, pale, blue-eyed and brown-haired, I would say we don't actually look alike. But the idea of us is exactly the same."

See for yourself below...

In a November 2023 Sirius XM interview, Leto was asked his thoughts on being compared to the Kardashians star, to which he said, "Really? Lucky me," and after a pause, added, "Thank you."

He also noted that if they were actually related, "Then I would have a rich relative. Because he's very wealthy, right? Yeah, that would be nice."

The Nocturnal Animals costars are aware of the comparison. In 2016, Fisher said on NBC's Today show that she once pasted Adams' face over hers for her family's holiday card.

It was no coincidence the actresses were both cast in Barbie. 

"I've been getting told for years that I look like the girl from Sex Education, who is Emma Mackey," Robbie told BuzzFeed in a July video. "She plays one of the Barbies in the movie pretty much because [director] Greta [Gerwig] and I thought it would be funny. We were gonna do like this whole joke about us looking similar."

She continued, "Then once we got all dressed up as our Barbies, we were kind of like, 'We don't actually look that similar.'' When she's got her brown hair and I've got my blonde hair, we don't look that similar. So we didn't put that joke in the movie. But when people come up and say, 'I loved you in Sex Education,' I just say, 'Thank you. Thank you so much.'"

"The celebrity I am mistaken for is Margot Robbie," the My Name Is Earl actress told Us Weekly in 2022. "It happens all the time."

The Help co-stars look so alike that director Ron Howard mistook Chastain for his own daughter.

At an Apple Store, "I was, like, walking by, I was like, 'Oh, that's Ron Howard,'" Chastain recalled. "And then my friend was with me (and) said he turned to someone, he goes, 'I think I just saw Bryce.' We look so much alike."

Bryce confirmed that the story was "legit" in an interview with Entertainment Tonight, saying her dad "was, like, shook. He really was."

"At first he was like, 'You really look so much alike,' " she said. "And I mean, obviously, I'm incredibly flattered, so it's great."

Neither celeb was upset when a social media user thought Witherspoon was Underwood.

"To the woman in the parking lot who just asked me if I was Carrie Underwood," the Legally Blonde star tweeted, "You officially made my day."

The Grammy winner quickly responded, "YOUR day?!?!?!?! That lady just made my whole life!"

"He's way better-looking than I was," Ruffalo said on the Tonight Show in March 2019. "Are you kidding me? I wish I looked like that, I swear to God."

Harry Potter and Frodo are well aware fans confuse them.

"Though we are both short, pale, blue-eyed and brown-haired, I would say we don't actually look alike," Radcliffe said in a joint interview with Empire magazine. "But the idea of us is exactly the same."

In fact, while in Japan, Radcliffe was even asked to autograph a photo of Wood.

"So the quickest way to deal with it was to just write, 'I am not Elijah Wood, signed Daniel Radcliffe,'" he explained, "and then hope someone translated that for him later."

The former Dancing With the Stars pro looks like Wonder Woman herself.

The Gossip Girl and Friday Night Lights actresses look so similar that they were cast as the leads in 2011's The Roommate, a Single White Female-esque horror flick.

The bearded stars look they may have been separated at birth.

The actresses look like they were separated at birth.

During an appearance on Watch What Happens Live, Andy Cohen pointed out the Downton Abbey actor's resemblance to the One Direction singer.

The Twilight star and Hunger Games alum share dark locks and glowing skin.

The Saturday Night Live alum and Oscar-winner could be confused as cousins, at the least.

These two get mistaken for each other all the time. Just ask them.

"When we were at the White House Correspondents' dinner," the comedian said when Banks stopped by Chelsea Lately. "Bill O'Reilly was talking to me and I said, 'I think you're confusing me with Elizabeth Banks,' because I wanted to get the f--k away from him."

Whether it's magic or just coincidence, the Breaking Bad star looks a lot like the Harry Potter actor.

We'd believe it if the singer and Gossip Girl star revealed they were long-lost relatives.

These actors certainly both have a similar sense of style.

The New Girl actress has been mistaken for the singer, who even played into their resemblance. In her "Not the End of the World" music video, Deschanel accidentally gets abducted by aliens who mistake her for the American Idol judge.

"Dude! You don't understand, I get this every single day," Justice told MTV News of her resemblance to The Vampire Diaries star. "Everyone always confuses me for her." 

A version of this article was first published on Tuesday, April 20, 2021 at 5 a.m. PT.