Melissa McCarthy's Oscars gown was ruined when Christian Siriano's studio flooded — so he made a new one in days

• Days before the Oscars, fashion designer Christian Siriano experienced a flood at his studio.
• The water damage ruined the dress he'd made for Melissa McCarthy, so he created a new one in days.

Melissa McCarthy essentially had an Oscars wardrobe malfunction before the event started this year.

During the red carpet — which was held on Sunday outside the Dolby Theatre in Los Angeles, California — designer Christian Siriano sat down with E! to discuss the celebrity ensembles he created this year.

He designed numerous looks including dresses for McCarthy, Siriano told E!, but had to design a new one for "The Little Mermaid" star when pipes burst and flooded his studio days before the event.

"Everything was okay, but it wasn't perfect — and it has to be perfect on a night like tonight or they just won't wear it," Siriano said of McCarthy's original dress. "So we were just freaking out all day."

The dress had a satin bodice with a high neckline and balloon sleeves, and a full skirt made from ruched tulle.

"It's a big moment," he said of the design. "She's about to be in such an incredible film for Disney playing Ursula in 'The Little Mermaid,' how fabulous. So I just wanted to give her a really fabulous fashion moment."

Siriano joked that the experience was "traumatizing to my life," and revealed that he didn't plan on mentioning the mishap.

"I wasn't gonna say anything about what really happened because I don't want the actress who's wearing something to know that her dress was fully remade," he told E!.

The designer also said the flood caused such havoc that he had to travel with the last gown he created and hand-deliver it to the star who will wear it.

"Donatella, are you dropping it off yourself?" he joked, poking fun at legendary designer Donatella Versace.

"Well a flood in the office won't stop us!" Siriano captioned the post.