The sweet words Prince William and Kate shared on the steps of the Lindo Wing

By Gemma Strong

Less than seven hours after Prince William and Kate welcomed their third child, a baby boy, the couple emerged from the Lindo Wing at St. Mary's Hospital to introduce their little prince to the world. It was an unforgettable moment in royal history as the couple posed for photographers and waved to onlookers while their son slept soundly in the protective arms of his loving mom. The brief photocall also showcased the caring and nurturing relationship the lovebirds share, as revealed by a lip reader who told the Mirrorwhat the royal duo said to one another as the posed for pictures.

TAP FOR GALLERY The happy couple pose with their new baby boy on the steps of the Lindo Wing.

William, 35, began by asking his wife, "Are you ok with him?" to which Kate replied with a smile, "Yes." Apparently spotting someone in the crowd, the Prince then said: "Look, there he is. Over there" – prompting the couple to wave to the left. "Let's just wave over there," Kate continued, as they waved to the right, before telling her husband: "It's a bit windy. He might get cold. Let's go now." "Sure," William replied.

Kate, 36, looked incredibly as she made her appearance outside the Lindo Wing, choosing a bright red dress by Jenny Packham - the same designer she chose following the births of Prince George and Princess Charlotte. Onlookers noted that is bore a resemblance to the red outfit chosen by Princess Diana when she and Prince Charles emerged from the Lindo Wing with newborn son Prince Harry in 1984.

The new royal prince slept through his big debut.

As the royal couple prepared to drive home to Kensington Palace with their baby boy, William spoke briefly to reporters, saying that he and Kate were "very happy, very delighted", adding: "Thrice the worry now!" He then joked: "We didn't keep you waiting too long this time." Asked about a name, he replied: "You'll find out very soon."

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