In the hilarious clip, posted on August 2, the 44-year-old actress blow-dries her hair in slow-motion, whipping her dark blond hair to and fro while Beyonce's hit song plays in the background.
"Starting last scene… We be all night," she writes in the caption, citing Bey's lyrics. "#greysanatomy #season11"
She also lists "trailer, 2 a.m." as her location — she "be all night" indeed! Hey, no one ever said the TV star lifestyle included early bedtimes!
Ellen wasn't the only Grey's star having a Beyonce-filled weekend: Jessica Capshaw (Arizona Robbins) attended one of the Los Angeles concerts of Bey and Jay's "On the Run" tour, thanks to an early birthday present from hubby Christopher Gavigan.
"Beyond epic pre-birthday surprise from my sweet," Jessica tweeted late on the night of August 3, alongside a selfie of herself and Chris clutching tickets. "Standing in the rain waiting for Mr. and Mrs. Carter to bring it."
Considering their busy filming schedules, we just hope that neither actress woke up in the kitchen saying, "How the hell did this #$%& happen?"
Grey's Anatomy Season 11 premieres on Thursday, September 25, at 8 p.m. ET on ABC.