Taking to Instagram, Reese shared a video introducing Marilee, who is now working alongside her on Big Little Lies - oh, and Nicole Kidman, Meryl Streep and Laura Dern.
Dream job, anyone?
"Hey, you guys, I want to introduce you to someone who has been working with me for five years," Reese says, before introducing Marilee as her "double."
"Don't we look alike?" she continues with Marilee replying, "we do, we totally lookalike."
Fans were quick to react to the post, writing: "Wow!!!!! Totally twinning!!" and "OMG twins!!"
We bet Marilee wishes just one thing: that she'd been given the iconic throw-ice-cream-at-Meryl-Streep's-head scene...