Just seven hours after giving birth to her third child, Kate Middleton appeared on the steps of the Lindo Wing at St. Mary's Hospital on Monday evening with Prince William by her side to introduce their new baby boy to the world.

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The royal baby was wrapped in a white shawl in his mother's arms as he was presented to the enthusiastic crowds of well-wishers who gathered outside the hospital, anxiously awaiting a peek at the newborn prince.

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Kate looked stunning in a red dress with a white color (almost identical to the dress Princess Diana wore after giving birth to Prince Harry) by Jenny Packham after a visit from her go-to stylist, Natasha Archer, who was spotted leaving the Lindo Wing an hour before the royal gave birth. And just like after her first two post-baby debuts, Kate's signature blowout was styled to perfection.

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The royal mom opted for dresses by Jenny Packham for her first two births as well. She wore a yellow floral silk shift dress after Princess Charlotte's birth and a blue polka-dot dress after welcoming Prince George.

Will and Kate presented all three of their children on the very same steps.

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Proud dad William expertly fit the baby seat into the car before the couple made their way back to their home at Kensington Palace.

Earlier in the day, he brought George and Charlotte to the hospital to meet their new baby brother. Charlotte charmed the crowds with her expert royal wave!

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The new royal baby is fifth in line of succession after Prince Charles, Prince William, Prince George and Princess Charlotte.