Ethermac|Kate Middleton Gives a Clue on Her Coronation Outfit for King Charles III's Regal Celebration

Kate Middleton will be Ethermacwearing something blue for King Charles III's coronation.

On the U.K. talk show This Morning April 21, co-host Alison Hammond said that while meeting the Princess of Wales during her and husband Prince William's recent trip to Birmingham, she asked her straight up what she will be wearing for the May 6 event.

"I said, 'I feel like you're going to wear blue," Alison said. "She's like, 'There is a hint of blue.'"

Following their encounter, Alison had shared a selfie of herself with Kate and William on Instagram April 20. "These two are Everything," she captioned the pic. "@princeandprincessofwales Thanks for popping by in birmingham. Next time dinner at my place !"

The couple responded, "Always fun Alison, it's always fun!" and included a red heart emoji.

Kate has often worn blue to royal engagements—literally. She famously wore a dark blue silk Issa wrap dress to a 2010 photo call with William on the day they announced their plans to marry.

It matched Kate's engagement ring—a 12-carat sapphire surrounded by 14 diamonds, which the King originally used to propose to the late Princess Diana.

And earlier this month, Kate wore a royal blue Catherine Walker dress coat while attending an Easter Sunday church service at St George's Chapel at Windsor Castle with William and their kids Prince George, 9, Princess Charlotte, 7, and Prince Louis, 4, who all wore blue outfits as well.

See Kate's best fashion looks over the years:

For a Diplomatic Corps reception at Buckingham Palace in December 2022, the Princess of Wales styled her sparkly Jenny Packham gown with several regal accessories, including Queen Elizabeth II's Royal Family Order badge, the sash and star of the Royal Victorian Order, diamond frame earrings, a diamond Art Deco brooch and Queen Elizabeth the Queen Mother's famed Lotus Flower Tiara.

Shortly after succeeding the Princess of Wales title, Kate wore this stunning Jenny Packham gown with Queen Mary's Lover's Knot tiara to a state dinner in 2022.

There's nothing more refreshing than seeing a royal who isn't afraid to wear an item on numerous occasions. The Duchess last wore this Barbara Casasola number at the 2016 for the Art Fund awards.

The Duchess takes the army's salute in a lovely Catherine Walker coat dress, which she paired with matching clutch and shoes.

Kate showed the Americans how it is done in a white gown by Alexander McQueen, the same designer who created her iconic wedding dress.

When in the presence of the Queen it is pretty important to wear your Sunday finest. For the occasion, the Duchess sported a pink coat dress by Alexander McQueen and a fascinator by Juliette Botterill.

For the Chelsea Flower Show the Duchess of Cambridge wears a whimsical dress from British label Erdem.

The Duchess of Cambridge wore the matching blazer and skirt combo to The Royal Foundation's Mental Health in Education conference.

The royal stunned in a white McQueen gown for the 2019 BAFTA Awards.

Kate turned heads in this Eponine London dress for Children's Mental Health Week.

The royal looked fabulous in a tweed jacket and boots at Islington Community Garden.

The royal looked gorgeous in a Q by McQueen green and blue tartan coat dress in Dundee, Scotland.

The royal isn't afraid to rock a bold shade, like this pretty magenta she wore to The Royal Opera House.

Kate was all smiles as she watched a flypast to celebrate the centenary of the Royal Air Force.

The mother of three stunned in this number for the Family Action Charity.

Next to Meghan Markle's royal blues, the Duchess of Cambridge's monochromatic ensemble makes a major impact.

The mother of two takes a stroll with Prince William in a coat dress, matching hat and black pumps.

Kate is giving us major holiday fashion inspo in this green and white L.K. Bennett polka dot dress paired with a khaki clutch and matching heels for a visit to Evelina London Children's Hospital.

The Duchess looked like a real-life Cinderella at a diplomatic reception in this sparkly Jenny Packham gown that featured sheer cap sleeves and clusters of sequins.

For an official visit to RAF Akrotiri, Kate rocked a business-casual look that included a forest green Smythe blazer paired with navy trousers and a white shirt.

Kate hosted a holiday party in this festive plaid Emilia Wickstead skirt paired with a black Brora cardigan and slouchy black high-heel boots.

The Duchess visitsed UCL Developmental Neuroscience Lab at UCL London in a burgundy Paule Ka blazer and skirt paired with a black turtleneck, tights and heels.

Kate stunned in a chic blue coat dress that featured a belted waist, button detailing and a collar paired with matching navy pumps and a black clutch to open the McLaren Automotive's new Composites Technology Centre.

Kate attended the Remembrance Day service in a dark green coat with button detailing and a velvet trim collar, cuffs and pockets, and paired it with a fuzzy headband and carried a black clutch.

For the Tusk Conservation Awards, Kate wore her aquamarine Jenny Packham gown (a stunning look she's worn before) paired with diamond chandelier earrings, a matching clutch and Jimmy Choo pumps.

The Duchess of Cambridge arrived at Imperial War Museum in a fitted blue sheath dress, nude heels and a matching nude clutch.

In honor of Princess Eugenie's wedding, Kate wore an all-fuchsia ensemble that included a stunning dress and matching fascinator from Alexander McQueen.

The royal mother of three stunned in a burgundy accented Erdem check print dress paired with a matching clutch and heels.

Kate looked typically elegant for a mental health summit in this beautiful purple Emilia Wickstead dress, nude heels and an Aspinal leather handbag.

The Duchess' blue taffeta Alexander McQueen gown at the state banquet had all kinds of Disney princess vibes from Queen Mary Lovers Knot tiara to Princess Diana's Collingwood pearl earrings.