Jessica Simpson shared on Instagram a photo of herself channeling Christie Brinkley's iconic, blonde-bombshell character from the original Vacation movie. Simpson's husband Eric Johnson is dressed in the image as the 1983 film's family man Clark Griswold, who was played by Chevy Chase. "Griswold and Brinkley #HappyHalloween," Simpson captioned the photo she posted Sunday. The singer-actress married Johnson in 2014. They have two pre-school-age children.