Michael and Carole Middleton arrived (in a cab) at the Lindo Wing of St. Mary's hospital in London – where Kate gave birth Monday – at 3 p.m. Tuesday afternoon.
After their hour visit, they spoke briefly to the press throng outside. "He's absolutely beautiful," said his grandmother, who spoke for herself and her husband.
Referring to her daughter and the baby, Carole Middleton said, "They are both doing well. We are absolutely thrilled."
And with that, the two jumped into the bright blue waiting cab and sped away.
Upon entering the hospital, the proud grandparents were met by Jonathan Ramsay, the lead clinician of the Lindo Wing.
A beaming Carole walked up the five steps slightly ahead of her husband as she acknowledged calls from the crowds of photographers with a smile.
Meanwhile, Michael nervously fidgeted with his navy blue blazer while following her inside.
Early Tuesday morning, the Duke and Duchess of Cambridge issued a joint statement, thanking the hospital.
"We would like to thank the staff at the Lindo Wing and the whole hospital for the tremendous care the three of us have received," it read. "We know it has been a very busy period for the hospital and we would like to thank everyone – staff, patients and visitors – for their understanding during this time."
Additional reporting by STEPHEN M. SILVERMAN