Influencer Tefi Pessoa interviewed stars of "Dune" at the film's UK premiere on Monday.
Pessoa wore a Silvia Astore dress to the event, and it appeared to have a leg cutout.
But her leg was supposed to go through the hole, as Pessoa shared in a viral TikTok.
Tefi Pessoa is laughing her way through a wardrobe malfunction.
Pessoa, 31, is a well-known social-media influencer and host at InStyle.
She's garnered over 1 million TikTok followers with her video series that details pop-culture moments, such as Robert Pattinson and Kristen Stewart's love affair and Princess Diana's journey to becoming a member of the royal family.
Pessoa was recently invited to attend the "Dune" UK premiere.
She interviewed stars such as Jason Momoa and Zendaya on behalf of Warner Bros. on the red carpet, as she shared on her social-media pages.
The long-sleeve velvet dress was floor length, and it had a high neckline.
The gown appeared to have a large, circular cutout on one leg when Pessoa walked the red carpet.
But following the premiere, Pessoa shared on both Instagram and TikTok that she found out after the event was over that her leg was supposed to go through the hole.
"Guys, I'm freaking out," Pessoa said in a TikTok about the dress. "I just found out that my leg was supposed to go through the stupid freaking hole."
"Why can't I dress myself? I'm an adult," she went on to say in the TikTok through laughter. On Instagram, she said she thought the hole was supposed to give the dress a "futuristic" look.
The video included a photo from Annie's Ibiza of a model wearing the dress with her leg inserted through the cutout, demonstrating how the gown was supposed to be worn.
Pessoa's TikTok about the dress had over 2.9 million views at the time of writing.
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