Blac Chyna and Tyga's son is a teenager now! On Instagram, the model took to her page to share a carousel of photos of King Cairo in honor of his thirteenth birthday. She chose pics from all throughout his life - from diaper days to soccer practice in Barcelona. It really shows just how fast they grow up!! Related: Blac Chyna & Rob Kardashian BACK TOGETHER? See for yourself (below): (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna/Instagram (c) Blac Chyna...