Baby Prince George's big day! Proud parents Kate Middleton and Prince William were seen arriving with 3-month-old son Prince George at St. James' Palace in London with big smiles on Wednesday, Oct. 23. As the Duke and Duchess of Cambridge, both 31, pulled up in a dark blue sedan and made their way inside the courtyard, a tiny cry could be heard from the guest of honor.

Prince William, looking handsome in a navy suit and light blue tie, held his adorable baby boy, who was wearing the traditional lace-and-silk baptismal robe. (Nearly every royal babe has worn the same gown since 1841, which was first fashioned for Queen Victoria's son, the future King Edward VII.) Mom Middleton looked stunning in a cream-colored skirt suit and matching fascinator.

Before entering the Chapel Royal, Prince George's parents briefly chatted outside with guests including Queen Elizabeth II, Prince Philip, Prince Charles, Camilla, Duchess of Cornwall and Prince Harry. Prince William was asked how his son was doing, and replied, "So far, so good." He was also heard commenting that baby George had just stopped crying.

A source told Us Weekly that the Duke and Duchess are "very excited" and Prince George "has been as good as gold."

Prince George will be christened in front of 22 guests by the Archbishop of Canterbury, the Most Reverend Justin Welby. His parents selected two hymns (Breathe on Me, Breath of God and Be Thou My Vision), two lessons (St. Luke ch. 18, versus 15-17 and St. John ch. 15, versus 1-5) and two anthems (Blessed Jesu! Here We Stand and The Lord Bless You and Keep You) for the 45-minute ceremony.

Watch the royal family arrive at the christening in the video above.