Royal Baby: Kate Middleton Looks Stunning as She Leaves Hospital

She and Prince William were greeted with cheers as they left the hospital with their new addition.

Just hours after giving birth, Kate Middleton, the duchess of Cambridge, looked striking as she greeted journalists and crowds while introducing her newborn son.

Wearing a red dress with a lacy Peter Pan collar, she also sported high heels while standing outside St. Mary's Hospital in London, flanked by her husband, Prince William.

The now-mother of three gave birth at 11 a.m. local time. A name has not been announced for the newest royal heir, who weighed in at 8 pounds and 7 ounces.

Kate's dress was from Jenny Packham, one of her favorite designers. 

The couple left the hospital with William behind the wheel. He carried the car seat holding his new son and placed it in the back seat with Kate. 

He waved at well-wishers and said "Thrice as much worry now!"