As soon as news broke that Kate Middleton, 31, was in labor Monday morning, celebrities took to Twitter to express their excitement about the royal baby's arrival. The Duchess of Cambridge was taken to the private Lindo Wing of St. Mary’s Hospital in west London's Paddington neighborhood at 6 a.m. with Prince William by her side.

According to reports, Middleton will be giving birth naturally and was not induced into labor. No one knows the sex of the royal baby, including the Duchess and Prince William, making the British royal birth that much more exciting. After her arrival at the hospital, a spokesperson confirmed that everything is going well. "Things are progressing as normal," they said.

The birth will not be made public until the royal family is briefed, and the royal baby -- boy or girl -- will be third in line for the throne. As the sex of the baby is not known, some celebrities made their own predictions. Journalist Piers Morgan, for one, decided both the sex and the name of the royal baby.

"PREDICTION: A boy, called George, weighing 8lbs 2oz #MysticMorgan," he stated. Morgan continued to write, "Keep Calm...and Carry On. #Kate #Labour."

"Whoop whoop the royal baby is comming," former Spice Girl and television personality Mel B wrote.

New mother and reality star Snooki said, "Push, girl, pushhhhhh ! #KateMiddleton #RoyalBaby #excited."

"I'm so excited for the royal baby!!" British singer Cheryl Cole said.

Kelly Osbourne wrote, "It's all so exciting, the royal baby is on its way!"

"Kate Middleton is in labor!!!! The royal baby is coming!! The wait is over! FINALLY!!!" wrote celebrity blogger Perez Hilton.

A spokesperson for the royal family stated that the newborn's official title will be "His or Her Royal Highness Prince or Princess of Cambridge." The title was announced earlier this month and chosen by Queen Elizabeth. Media from around the world is surrounding St. Mary's to get a glimpse of the royal family. Both Prince William and his brother Harry were born at St. Mary's, with William the first heir to be born in a hospital; previous heirs were born at the home of a royal family member. After the new royal baby is born, Prince Harry will be demoted to fourth in line to the British throne. This will be the couple's first child together.