Meanwhile, the birthday boy dressed up like Darth Vader, and posed for some silly photo with both his mama, as well as his older sister Willow Sage, 9. Pink's daughter Willow and son Jameson. Pink ...

“Happy Birthday Saint! I can hardly believe you are 4 years old! You are growing up so fast,” Jenner wrote, continuing, “You are such a sweet, funny, kind and amazing boy and I love seeing ...