The "NYPD Blue" actress caused a storm on Instagram as she shared her own take on the Elf on the Shelf phenomenon, by posting a snap of Pharrell Williams with a teeny Garcelle perched on his shoulder.
"You've heard of Elf on a Shelf, now get ready for this," she wrote, alongside a crying laughing emoji.
"I know you've all heard of Elf on a Shelf, but have you heard of...(Inspired by @garcelle)," she wrote.
"Oh hey @elizabethbanks! I see your Hanks-on-Banks and I raise you a Grease-on-Reese," she captioned the hilarious image.
Jennifer was next up, sharing a picture of herself with Sean Penn sitting on her shoulder. "Hey, @reesewitherspoon @elizabethbanks - did you challenge me? I'm pretty sure you did," she wrote, alongside the hashtag, "#PennOnJen."
Other stars to take part in the challenge included Sarah Michelle Gellar - who shared a picture of herself with Dan Brown's "The Da Vinci Code" on her shoulder for "bestseller on Gellar" - Mark Ruffalo, Gal Gadot, and Bryce Dallas Howard.