There's a royal wedding happening, which means there are plenty of familiar faces — and some not-so-familiar ones, too. Anyone who follows the royals knows that there's more to the family than just William and Harry. With so many royal guests attending Princess Eugenie's wedding, here's a primer on who's who and exactly how they figure into the family.

Lady Amelia Spencer

Birthdate: July 10, 1992

How she plays into the royal family: Amelia is the second born (along with twin sister Eliza) to parents Earl Charles Spencer and model Victoria Aitken.

Lady Eliza Spencer

Birthdate: July 10, 1992

How she plays into the royal family: Twin sister to Amelia. Also a fan of fascinators.

Lady Kitty Spencer

Birthday: December 28, 1990

How she plays into the royal family: She's a sibling to the twins. She's also a model.

Louis Spencer, Viscount Althorp

Birthday: March 14, 1994

How he plays into the royal family: He's the heir apparent to the earldom of Spencer. Why? Because of old British laws, Lord Althorp, not his eldest sister, inherits the estates and title.

Lady Charlotte Diana Spencer

Born: 2012

How she plays into the royal family: Her dad's Princess Diana's brother, Earl Spencer.

Lady Lara Spencer

Born: 2006

How she plays into the royal family: Princess Diana's neice, Lady Lara lives with her mother, who keeps her away from the media. Her parents, Charles Spencer 9th Earl Spencer and Caroline Freud, divorced in 2007.

Edmund Charles Spencer

Born: 2003

How he plays into the royal family: Like his sister, Lara, Edmund lives with his sister and stays out of the spotlight.

George Edmund McCorquodale

Birthday: November 17, 1984

How he plays into the royal family: Another one of Princess Diana's nephews. He was married in South Africa back in 2016. Harry attended, but William and Kate didn't, since they were on holiday with their kids.

Celia Rose McCorquodale

Born: 1989

How she plays into the royal family: Sister to George Edmund, she's the daughter of Lady Sarah McCorquodale, Princess Diana's sister.

Emily Jane McCorquodale

Birthday: July 2, 1983

How she plays into the royal family: Princess Diana's niece. She was diagnosed with cancer, but is now in remission. She got married in 2012.

Laura Jane Pettman

Birthday: July 19, 1980

How she plays into the royal family: Princess Diana's niece.

Alexander Robert Fellowes

Birthday: March 23, 1983

How he plays into the royal family: Princess Diana's nephew, he has two children: Robert George and Rose Jane Fellowes.

Eleanor Ruth Fellowes

Birthday: August 20, 1985

How she plays into the royal family: Harry and William's first cousin.

Zara Tindall

Birthday: May 15, 1981

How she plays into the royal family: Daughter of Princess Anne and Mark Phillips and the eldest granddaughter of Queen Elizabeth II. She's a pro equestrian.

Peter Phillips

Birthday: November 15, 1977

How he plays into the royal family: His mom is Princess Anne. He also got married at St. George's chapel back in 2008.

Princess Eugenie of York

Birthday: March 23, 1990

How she plays into the royal family: Younger daughter of Prince Andrew, the Duke of York, and Sarah, Duchess of York. She's ninth in line for the throne.

Princess Beatrice of York

Birthday: August 8, 1988

How she plays into the royal family: The daughter of Prince Andrew, the Duke of York, and Sarah, Duchess of York. She's number eight in line for the throne.

Lady Louise Windsor

Born: 2003

How she plays into the royal family: She's Prince Edward's only daughter.

James, Viscount Severn

Born: 2007

How he plays into the royal family: He's the only son of Prince Edward and 11th in line for the throne.