Prince William and Kate Middleton Reveal Their Baby Girl Outside the Lindo Wing

The newborn princess was wrapped in a white blanket.

— -- Britain's littlest princess has made her debut.

Prince William and Kate Middleton stepped outside the Lindo Wing with their baby girl this evening, the same day the Duchess of Cambridge gave birth.

The baby, whose name has not yet been released, was wrapped in a white blanket in the Duchess of Cambridge's arms.

Kate, not even one-day post-partum, was glowing in a yellow and white dress by Jenny Packham.

The couple were smiling ear to ear as they waved to the crowds, but neither William nor Kate made any comments. After a few moments, they went back inside.

A few minutes later they came back out and headed straight to a car, and William put the baby in a car seat in the back. William got in the driver's seat and the crowd cheered as they drove away.

Prince William brought Prince George by the Lindo Wing to visit earlier today, but George had already returned home by the time his parents and new sister made their much-anticipated debut.

When William left to pick up George, he told the crowd outside that he and Kate were "very happy."

William, Kate and the baby are leaving the hospital this evening to go to Kensington Palace.

The Duke and Duchess of Cambridge welcomed a baby girl at 8:34 a.m. local time, Kensington Palace said today. She weighed in at 8 pounds and 3 ounces and was said to be doing well.

"[Kate is] very hands-on when it comes to decorating," said Victoria Murphy, ABC News' royal contributor. "We've heard about her out and about shopping, going to shops, buying things herself."

While William will return to work soon enough, Kate will likely take a few months off to spend time with the children. However, royal watchers shouldn't expect to catch a glimpse of them in London. Instead, the family is expected to spend a good deal of time at Amner Hall, located on the queen's estate in Norfolk, England, while the children are young.

"It's a kind of completely enclosed childhood ... and I think that's what William and Kate, particularly William, wants for his children," said royal contributor Roya Nikkhah. "He wants to have that incredibly normal life that's completely private, that's away from the spotlight."

President Obama and the First Lady said in a statement today: "Michelle and I are delighted to congratulate the Duke and Duchess of Cambridge, her Majesty the Queen and the Royal Family, and all the people of the United Kingdom on the birth of the Royal Princess.  On behalf of the American people, we wish the Duke and Duchess and their son George much joy and happiness on the occasion of the arrival of the newest member of their family."

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