Rebel Wilson has just returned from an incredible getaway in the Austrian Alps and she's fallen right back into the arms of… her sister!The star, 40, posted a fun-filled video on Instagram, and in it, she's wearing matching silk pajamas with her younger sibling, Annachi.MORE: Rebel Wilson looks like a model for a luxury spa in bathrobe-clad selfie The pair wore red and white striped sleepwear and used a rosy-cheeked filter, giving them a flushed look. WATCH: Rebel Wilson and her sister wear