Missy Rayder is the latest model-turned-mommy. The Wisconsin-born stunner, who’s posed for Burberry, Balenciaga, Prada, Vogue and Elle, gave birth to her first child on Tuesday, bouncing baby boy Luka. The tot weighed in at 9 pounds, 7 ounces, and mom and baby are doing great. “He is so precious,” said Rayder, 34, whose sister Frankie was also a top model. (The two appeared in several Gap holiday ads together in the mid-2000s.) The dad is her boyfriend, Marko Velickovic, an artist from Paris.