In honor of this match made in Instagram heaven, here are five must-see snapshots of stars back when all they wanted in life was a sack full o' candy and the coolest costume on the block.
The KardashiansBefore the drama and the designer duds, Khloé strapped on a ladybug costume for Halloween festivities with equally spirited sister Kourtney and mom Kris Jenner, who dressed up as a geisha. (Picture above.) "Vintage Halloween," writes Kourtney.
Pete WentzBefore he rocked, the Fall Out Boy bander totally sucked ... when he dressed up as a vampire. "Favorite time of the year," he writes.
Emma RobertsAnd to think, this was taken before Roberts headed to American Horror Story: Coven.
Can you spot Sofia? "22 years ago in Barranquilla !!!Manolo's first Holloweeeen! He was one month old," writes the actress, who's seated second from the left.