The baby was born at 11:01 a.m. Monday weighing 8 lbs., 7 ounces, Kensington Palace wrote on Twitter.
Many are betting on a traditional royal name for the baby, with bookmakers saying Mary, Alice, Arthur and James are the most popular guesses.
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He told the Daily Mirror that the 36-year-old actress has "clearly forgotten her roots" and she is breaking her family apart .
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She stressed that it is Russian Federation and Syria that bear the responsibility for the security of the OPCW experts. A Pentagon spokeswoman said there was no US military activity in the area.
The couple now live at Kensington Palace and a year ago William gave up his day job as an air ambulance pilot to concentrate full time on royal duties on behalf of his grandmother, having faced some criticism from British newspapers who dubbed him "workshy Wills". "I wish them great happiness for the future", May said.
Shortly after the birth announcement, fellow royal watchers and public figures rushed to share their joy at the arrival of a younger brother for Prince George and Princess Charlotte, including 9Honey's royal commentator Victoria Arbiter.
That leaves Prince Harry, reformed playboy and everybody's favorite royal (reportedly including Queen Elizabeth), sixth in line. She is expected to now take time off from official royal duties, as she did after the births of her older children.
Kate, as us peasants call her, and the little Prince are doing very well so that's all that matters right now. The palace said Kate was in "the early stages of labor". Kate and William might consider this when deciding on their son's middle names. As with her other two pregnancies, she suffered from hyperemesis gravidarum, or acute morning sickness.
The Royal baby has been born on St George's Day, which celebrates the patron saint of England. William and Kate's firstborn is named George Alexander Louis and his sister is Charlotte Elizabeth Diana - honouring both her great-grandmother Queen Elizabeth II and her late grandmother, Princess Diana. Albert and Henry seem to be the most guessed names on the Internet meanwhile, as the rest of the world waits with bated breaths to see the first glimpses of the royal newborn.