Blake Lively bares bum in cheeky snap

The Gossip Girl star and mum-of-three, 33, flaunted her bum in a patterned bikini by the pool, joking in the caption: “Go see @freeguymovie this weekend or you’ll be bummed.”Keeping up her typical cheeky trolling of Reynolds, Lively — who has three daughters with the actor — also included a GIF of her husband making a shocked facial expression.RELATED: Lively sizzles in revealing red carpet dressRELATED: Free Guy review – an entertaining rip-offThe stylish duo turned heads at the premiere of the film last month, where Lively donned a revealing backless, sequined gown with bold cut outs for the night away from the kids.The star finished the look with a slicked-back plait, statement rings and stud earrings.Reynolds cut a similarly chic figure in a beige corduroy suit, checked shirt and brown suede shoes with grey socks.RELATED: Lively calls out ‘alienating’ designersOn his Instagram page, Reynolds couldn’t resist quip aimed at his wife (as we’ve come to expect from the pair), writing that he was thrilled that Lively was his date as it meant he could finally make his Instagram debut with his wife of nearly a decade.“What a huge night for #FreeGuy. And what a huge night for @blakelively because this means we’re Instagram official,” he shared with photos from the red carpet event. “I know how important that was to her,” he added.The couple met on the set of 2010 film Green Lantern, but didn’t start dating until a year later.Taking a walk down memory lane on the SmartLess podcast recently, Reynolds joked: “I met Blake on the darkest crease in the anus of the universe called Green Lantern.“We were friends and buddies and about a year-and-a-half later we went on a double date but we were dating separate people,” he explained.“Next thing you know, she was going to Boston, I was going to Boston and I said, ‘Well, I’ll ride with you.’ We got on the train and we rode together,” Reynolds said, adding, “I was just begging her to sleep with me.”They wed in September 2012 and now have three daughters, James, 6, Inez, 4, and Betty, one.