Rachel Bilson’s recent throwback photo has fans doing a double take. The O.C. alum took to Instagram on January 31st to share an old photo with Bohemian Rhapsody star Rami Malek, who reportedly attended the same high school, Notre Dame High School, as Bilson. The actress captioned the Instagram, “Hey @ramimalek where’d you get that gold chain? #tbt #oscarworthy #dontforgetthelittlepeople.”

Check out the throwback photo below.

In the photo, Bilson and Malek embrace as teens—with Malek rocking a gold chain necklace. The baby-faced throwback is a lot to unpack. However, the story does not stop there. Fans are convinced that the Malek in question is not, in fact, the Oscar-winning actor, but instead his twin brother, Sami. We know what you’re thinking. His what? Yes, the Mr. Robot star has a twin brother named Sami.

Credit: Rachel Bilson/Instagram

Here’s a photo of the siblings for reference.

Credit: Paul Archuleta/FilmMagic/Getty

Wow. This is quite the mystery. Unlike his Hollywood brother, Sami works as a teacher in Los Angeles. The actor once mentioned his twin in a 2015 interview on Jimmy Kimmel Live!, where he revealed he once pretended to be Sami to help him pass a test for his teaching degree.

Given all of these revelations, is it at all possible that Bilson took a photo with Sami rather than Rami? A mystery for the Hollywood ages.