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And just to clarify, she wrote in the caption, \"True story. #BryceDallasHoward is in #JurassicWorld\"

That's when a fan of one or both actresses decided to take up the cause, posting a hilarious video Sunday on YouTube. Called \"JESSICA CHASTAIN: The Musical (Bryce Dallas Howard),\" it features clips from both actresses' films and an original song with the catchy refrain \"I am not Jessica Chastain.\"

Piggybacking on the video, Chastain followed up with her own Dubsmash video that features the music from the YouTube parody.

In the quick clip, the redheaded actress can be seen lip-syncing, \"But it's time to put an end to the confusion/I am not Jessica Chastain.\"

But when she removes her sunglasses, it's...Bryce Dallas Howard.

\"Everyone get it yet? : ) performance by #BryceDallasHoward not #JessicaChastain,\" Chastain wrote on Instagram.

A video posted by Jessica Chastain (@chastainiac) on Jun 8, 2015 at 11:46pm PDT

In case you're more confused than ever, Howard explained how the pair collaborated on the video.

\"My friend emailed me about that [musical] video yesterday, and it had just posted two days ago. I was like, 'This is brilliant!' And he said, 'You should totally do a Dubsmash,' so we did it,\" she told reporters at the \"Jurassic World\" Los Angeles premiere.

Howard then sent the video to Chastain.

\"[Jessica] was like, 'OK, this is totally a thing. We need to use this power for good, and do a movie together playing sisters,'\" Howard said.

Just to clarify, Howard, 34, is the daughter of Ron Howard and star of \"Lady in the Water\" and \"Spider-Man 3.\" Chastain, 38, is the star of \"Zero Dark Thirty\" and \"A Most Violent Year.\" Both appeared in the 2011 film \"The Help.\"

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