Princess Charlotte & Prince George Appear in New Photo Together—See the Cute Pic of Royal Baby No. 1 and 2!

Their mother, Kate Middleton, took the pic herself, Kensington Palace said

A photo posted by Kensington Palace (@kensingtonroyal) on Jun 6, 2015 at 1:02pm PDT

UPDATE: Kensington Palace has released THREE more new photos of Princess Charlotte and Prince George!

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There she is again! They grow up so fast, don't they, Will and Kate?

Kensington Palace released on Saturday on Twitter and Instagram a new photo of Kate Middleton and Prince William's newborn daughter, Princess Charlotte, pictured with her big brother Prince George for the first time.

"We're delighted to share the first photo of Prince George with his little sister Princess Charlotte," the caption reads. "#WelcomeToTheFamily."

"This photograph is the first of four official photographs being released today, taken by The Duchess of Cambridge in mid-May," it says.

This is the first photo of the children since the royal couple debuted their little girl outside a St. Mary's Hospital in London on May 2, the day she was born. George, who is almost 2, was last photographed that day at the medical center with his father when they went to visit Kate and newborn Charlotte.

Kensington Palace released the pic on its Twitter and Instagram pages as a thank-you to the many fans who showed their support.

The Duke and Duchess are extremely grateful for the wonderful messages they've received on the birth of Princess Charlotte. Mail sacks with congratulations from across the globe arrived at St James's Palace shortly after Princess Charlotte's arrival.

A photo posted by Kensington Palace (@kensingtonroyal) on Jun 6, 2015 at 4:08am PDT

Here are some impressive hand-painted cards & group projects we've received from schoolchildren & @Girlguiding groups pic.twitter.com/Jjxnh7M2wd

? Kensington Palace (@KensingtonRoyal) June 6, 2015

Among messages of congratulations, The Duke and Duchess of Cambridge have received impressive hand-painted cards and group projects from schoolchildren and Brownie groups. Thank you to everyone who has taken the time to make handmade gifts for Princess Charlotte - here are a few of them! Their Royal Highnesses are very grateful for all the warm wishes, and to harness this generosity of spirit, have also suggested that people might like to celebrate this happy occasion by looking to support those more in need; perhaps a local children's charity or The Imperial College Healthcare Charity, as a way of marking the birth of their second child.

A photo posted by Kensington Palace (@kensingtonroyal) on Jun 6, 2015 at 4:42am PDT

In one month, Charlotte is set to be christened at St. Mary Magdalene Church at her great-grandmother Queen Elizabeth II's Sandringham estate, where Anmer Hall, Kate and William's 10-bedroom country home, is located.

The church is also where William's late mother, Princess Diana, was baptized.