Blake Lively has challenged her husband Ryan Reynolds in a tongue-in-cheek message which she posted to her Instagram story.The actress, who recently gave birth to the couple's fourth child, regularly takes to social media to joke around with her husband, and this Sunday evening it was no different. Find out all about the comedic couple's love story in the video below.WATCH: Everything we know about Blake and Ryan's wonderful love storyBlake's husband Ryan started the story thread, as he posted to his Instagram a photo celebrating his wife's drink mixer brand, Betty Buzz.