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Britain's Princess Charlotte and her brother Prince Louis are seen in this photograph released by Kensington Palace on Princess Charlotte's third birthday, at Kensington Palace in London on May 2, 2018.Supplied/Reuters

Britain’s royal family released the first two official photographs of newly born Prince Louis on Sunday, one of which shows him being held by his sister Princess Charlotte, aged three.

Louis, who is fifth in line to the British throne, was born on April 23 weighing 8lbs 7oz.

Both the photographs were taken at Kensington Palace by Catherine, Duchess of Cambridge, the children’s mother and wife of Prince William, Queen Elizabeth’s grandson.

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A handout picture released by Kensington Palace on May 5, 2018 shows Britain's Prince Louis of Cambridge posing for a photograph, taken by his mother.DUCHESS OF CAMBRIDGE/Getty Images

The first photograph, which the palace said was taken on April 26, shows Louis propped up against a white cushion, wearing a white jumper and trousers.

The second photograph, taken on May 2, Charlotte’s third birthday, shows the princess holding her sleeping younger brother affectionately.

Due to a 2013 change in the law, Charlotte is the first British princess for whom the arrival of a younger brother does not mean being demoted down the line of succession.

Palace officials said Louis would not join the rest of his family at the May 19 wedding of his uncle, Prince Harry, to U.S. actress Meghan Markle.

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