Today is a big day for Prince George - it's the day of his christening. Check out these pics of past royal christenings.
Here's Prince George's grandfather Prince Charles pictured with his mother the Queen. He was christened in 1948. It's a tradition that royal babies wear a gown that was first worn by Queen Victoria's eldest daughter in 1841.
Royal christenings are a big occasion for the family - here is the Queen when she was christened in 1926, pictured in her mother's arms and with her father King George VI and grandfather King George V behind her.
Today is a big day for Prince George - it's the day of his christening. It's going to be a private ceremony at the Chapel Royal at St. James' Palace in London.
It was also worn here by Prince George's dad, Prince William. Here he is on his christening day in 1982 held by his mother with the Queen, Prince Charles, the Duke of Edinburgh and the Queen's mother around him.
Today Prince George will be wearing a replica of the traditional gown as the original - which is now more than 170 years old - is at the Museum of London.