Prince Louis' christening: Kate Middleton and Prince William debut their family of 5!

Prince Louis' christening: Kate Middleton and Prince William debut their family of 5!

It's a family of five!

Prince William and Duchess Kate debuted their adorable family of five on Monday for baby Prince Louis' christening at the Chapel Royal in St. James' Palace in London. The parents of three were photographed with their full family -- including Prince George, 4, and Princess Charlotte, 3 -- for the first time at the christening since welcoming 11-week-old Louis into the world on April 23.

Kate arrived in a cream-colored Alexander McQueen dress while holding a sleeping Louis in her arms. Right along with her was husband, William, who was wearing a classic blue suit while holding the hands of both George and Charlotte as they entered the chapel and shared a chat with Justin Welby, the Archbishop of Canterbury, who will be conducting the service. He also conducted George and Charlotte's christenings in 2013 and 2015, respectively, and also officiated Prince Harry's wedding to Meghan Markle back in May.

See photos from Prince Louis' christening:

Though Charlotte and George had visited the Lindo Wing on the day that Louis was born, they left through a back entrance hours before Will and Kate debuted Louis on the steps of the private hospital facility.

Meghan and Harry were also there on Monday, with Harry opting for a suit that was slightly darker than his older brother's and Meghan rocking an army green dress with a matching see-through hat.

Also there was Kate's sister, Pippa Middleton, who showed off her burgeoning baby bump as she arrived to the chapel alongside the rest of her family and a few of Louis' godparents, who were announced ahead of the ceremony.

Louis' godmothers are Lady Laura Meade, husband of Princess Charlotte's godfather, James Meade (the couple is good friends with Will and Kate); Hannah Carter, who is an old friend of Kate's; and Lucy Middleton, Kate's cousin. His godfathers are Nicholas Van Cutsem, who has been a close friend of William since childhood; Harry Aubrey-Fletcher, who attended prep school and Eton College with William; and Guy Pelly, who is a longtime friend of the couple and planned Williams' bachelor party.

See photos from Prince Louis' debut: