Kourtney Kardashian celebrated her sons Mason and Reign's shared birthday with a heartwarming message on Instagram on Thursday. "My twin boys born five years apart," she captioned the snap of them sipping juice. "Luckiest mummy in the world. Happy birthday to them. 🎈🎈" The Keeping Up With the Kardashians star gave birth to Mason, her first child with Scott Disick, on Dec. 14, 2009, while Reign was born on the same day in 2014. She even rang in the boys' special day by taking them and their sister, Penelope, to Disney World with Scott and their grandmother Kris Jenner. So sweet!
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