In the reboot, Ed Helms from The Hangover franchise is playing the grown-up Rusty Griswold!

Ed Helms posted this on his Hootsuite page; he's currently on set for the reboot of National Lampoon's Vacation. I'm weird; I just assume nobody in Hollywood ever gets old. So imagine my surprise! Leslie Mann from This is 40 will play the grown-up Audrey Griswold.

edhelms via Hootsuite