The First Photos of Kate Middleton's Royal Baby Bump Are Here

The Duchess has made her first public appearance since announcing her third pregnancy.

The Duchess of Cambridge, Kate Middleton, has made her first public appearance since announcing that . On Tuesday, World Mental Health Day, the Duchess stepped out with Prince William and Prince Harry with their campaign for a reception at Buckingham Palace, where they met mental health workers from across the UK.

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Heathcliff O'Malley - WPA Pool/Getty Images

Heathcliff O'Malley - WPA Pool/Getty Images

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Kate, who covered her growing baby bump in a light blue Temperely London dress, has not been seen in public since Aug. 30, when she joined the Princes at Kensington Palace to .

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According to , a royal aide confirmed on Tuesday that the Duchess is still suffering from hyperemesis gravidarum, an acute form of morning sickness she also had while pregnant with George and Charlotte, but things have been "improving." The aide added, "She is delighted to be here tonight." The condition likely caused Kate to miss 4-year-old George's first day of school at Thomas's Batersea on Sept. 8. At the time, a source told that Kate "watched the news from home" and "was desperately sad that she couldn't make it."

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Shortly after Kensington Palace confirmed Kate's pregnancy, reported that the Duchess was "less than three months" along, which means George and Charlotte will have a new sibling to fawn over in late spring.

Watch Kate Middleton's Beauty Evolution Unfold:

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