5 Things to Watch at Princess Charlotte's Christening

— -- Princess Charlotte, the first daughter of Prince William and Princess Kate, will be christened in the U.K. today.

The christening for the fourth-in-line to the British throne will be a family affair with unique details.

Here are five things to watch at the royal celebration:

1. Princess Charlotte Elizabeth Diana

The princess is just three days past her two-month birthday. The last time Princess Charlotte was seen in public was when she left St. Mary’s Hospital in London the day she was born, May 2. The only other glimpse of the newborn came in photos released last month, and taken by Duchess Kate, of Charlotte being held by her big brother, Prince George.

2. The Godparents

Prince William and Princess Kate announced Princess Charlotte's five godparents this weekend: Kate's cousin Adam Middleton, William's cousin The Hon. Laura Fellowes, and three of the couple's friends, Thomas van Straubenzee, Sophie Carter and James Meade.

3. Who’s Who of the Royal Family

As with Prince George’s christening, at which the attendance was capped at 22, only immediate family, godparents and their spouses have been invited. The queen, Prince Philip, Prince Charles and Camilla will be joined by Kate's siblings, Pippa and James, and her parents, Carole and Michael Middleton. Prince Harry, Charlotte’s uncle, will miss the christening because he is spending the summer in Africa.

4. World-Famous Photographer

Recording the milestone in Princess Charlotte’s life will be none other than world-renowned photographer Mario Testino, tapped by Prince William and Princess Kate to take the official photographs of the christening party after Charlotte’s baptism. Testino, 60, also photographed William and Kate for their engagement photo and was chosen by the late Princess Diana, Charlotte’s grandmother, to photograph her for Vanity Fair.

5. Connection to Princess Diana

The church where Princess Charlotte will be christened, St. Mary Magdalene Church, is the same church where her late grandmother, Princess Diana, was baptized in 1961. In choosing St. Mary Magdalene Church for Charlotte’s christening, Prince William and Kate are making a poignant nod to William's mother, as they did when they selected their daughter's name, Princess Charlotte Elizabeth Diana. The church is located on the Queen's Sandringham Estate. Diana was born at Park House at Sandringham and spent time there as a young child.