Blake Lively wishes sister Robyn happy birthday 'Thank you for giving me ... trends now

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Blake Lively never misses a moment to roast the people she loves - and her sister Robyn is not exempt. 

She shared a photo to her Instagram Stories with her older sister/bestie and wrote 'Best. Friend. Ever.'  and 'Happy birthday @robynlively' over the snap.

But Blake - who is expecting her fourth child with husband Ryan Reynolds - wasn't done yet. 

'Thank you for giving me someone to bully for life without ever having to feel guilty,' she added as Donnie Osmond's I'll Make a Man Out of You from Mulan played in the background.

'Also known as: Thank you for being my sister,' she continued.