Middleton, 41, sported a fiery red asymmetric Alexander McQueen blazer with matching flared pants. She topped off her look with dangling silver earrings, velvet pointed-toe heels and a red clutch.
She was accompanied by her husband Prince William, who donned a navy-blue suit with a red tie for the campaign launch event, hosted by The Royal Foundation Centre for Early Childhood at BAFTA in central London.
The Princess of Wales stepped out in a powerful red business suit to attend a launch event for her campaign, which focuses on the "crucial importance" of how the first few years of a child’s life will impact their future. (Getty Images)
However, Princess Kate truly stole the show as fans took to the internet and noted the trendy lady in red.
Kate Middleton, 41, sported a fiery red asymmetric Alexander McQueen blazer with matching flared pants. She topped off her look with dangling silver earrings, velvet pointed-toe heels and a red clutch. (Getty Images)
"I love that suit, a true power red!" one Twitter user wrote of the stunning royal.
"Now that’s how you rock a red outfit!" another royal fan commented.
Others swooned over the business ensemble and expressed, "Red is her color."
Meanwhile, as Middleton radiated in red, the internet could not help but notice the way Prince William proudly supported his wife in photos.
Meanwhile, as Kate Middleton, right, radiated in red, the internet could not help but notice the way Prince William proudly supported his wife in photos. (Getty Images)
"Love how he is looking at her with such pride and support. Happy for them."
Prince William, Prince of Wales and Catherine, Princess of Wales attend a pre-campaign launch event, hosted by The Royal Foundation Centre for Early Childhood, at BAFTA. (Getty Images)
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The Princess of Wales hopes to influence and raise awareness of how critical the first five years of a child’s life are with her passionate "Shaping Us" campaign.
Middleton penned a letter speaking out about the long-term campaign.
"The way we develop, through our experiences, relationships, and surroundings during our early childhood, fundamentally shapes our whole lives. It affects everything from our ability to form relationships and thrive at work, to our mental and physical well-being as adults and the way we parent our own children," she wrote in part.
"In these difficult times, it is more important than ever to help support parents and caregivers provide loving, safe and secure homes for their babies and young children to thrive."
The Prince and Princess of Wales share three children together -- Prince George, 9, and Prince Louis, 4, and daughter Princess Charlotte, 7.