Princess Catherine, also known as the Princess of Wales, has made a public appearance to show her support for a cause that is dear to her.

The fashion world was abuzz when Michelle Obama wore a self-portrait dress to the United Nations Gallery Assembly.

Now, Princess Catherine has joined in on the trend, debuting a beautiful white gown from the same label at the London premiere of the film “A Street Cat Named Bob.”

The princess looked absolutely glamorous in her floor-length gown, which featured lace and pleat detailing.

At first glance, the dress may remind you of a modest wedding gown, but it has a playful twist with a thigh-high slit and a peekaboo bodice, similar to Michelle Obama’s mixed-media fit and flair dress.

To complete her chic look, Princess Catherine accessorized with burgundy pumps, a matching clutch, and a delicate floral brooch.

Although her exact dress is no longer available, there are similar options in black, as well as alternative choices to explore.

Her beauty routine for the evening included loose waves in her brunette locks and her signature natural smoky eye.

Before the screening of the film, Princess Catherine had the opportunity to mingle with the stars, including the film’s feline protagonist, Bob the Cat.

In a Twitter video shared by Kensington Palace, she can be seen petting the adorable creature with sheer delight.

This is not the first time Princess Catherine has brought royal glamour to a Hollywood film opening.

Just over a year ago, she attended the world premiere of the James Bond movie “Spectre” with Prince William in London.

Typically, white dresses are reserved for weddings and the height of summer.

However, Princess Catherine managed to make it look completely appropriate for both the event and the season.

Her previous appearances at the Royal Ascot showcased more extravagant looks, with hats, colors, and tails being encouraged.

But this time, she opted for a more understated look, wearing a frilly white lace dress by Dolce & Gabbana, paired with a gold fascinator.

It’s worth noting that despite her worldwide recognition, Princess Catherine wore a badge that read “HRH the Duchess of Cambridge.”

There was even speculation about the color of her hat, with beige or cream being the favorites.

It would have been quite a surprise if she had chosen a fuchsia cone or a sequined flapper-style hat.

In 2016, during the opening day of the Royal Ascot, Princess Catherine stunned in a gorgeous white lace dress by Alexander McQueen.

The dress appeared to be a customized version of the designer’s lace mini-dress.

She completed the look with Gianvito Rossi 105 pumps in praline, diamond and pearl drop earrings that belonged to the late queen, and a coordinating white and cream hat adorned with a large bow and floral details.

Since arriving in Sydney, Princess Catherine and Prince William have embarked on numerous engagements.

One standout outfit from their visit was a white eyelet frock by Zimmermann, an Australian label known for its cool and trendy designs.

The dress perfectly captured the essence of summer, with a flirty and fun style that was far from stuffy.

To complement the dress, she chose Stuart Weitzman cork and rat-tan wedges, which proved to be suitable for a jog on the beach.

Princess Catherine continues to make fashion statements with her impeccable style choices.

Her support for various causes and her ability to effortlessly blend sophistication with playfulness have solidified her status as a style icon.