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The Crown star's partner, retired lacrosse player Paul Rabil, announced the arrival of their child via Instagram on Sunday. Rabil posted a carousel of snaps, including one which showed the baby snuggling into his chest, and another of Kirby and their newborn lying on a bed. He wrote in the caption: "I'm learning that becoming a parent slows you down and wakes you up at the same time. That I'm really grateful for everyone's health, that I get to wake up everyday to mum's enormous love, and that we get to have you in our lives now.”