Big Sky star Kylie Bunbury and husband Jon-Ryan Alan Riggins announced the arrival of their first child, a son named Rumi Walker, on Monday.Seven days after the birth of their bundle of joy, the32-year-old actress shared the first snap of their infant as he tenderly wrapped his hand around one of her fingers.'Rumi Walker Riggins. 12.6.21,' she captioned a picture of her little boy sound asleep in his bassinet.