Anne Hathaway caught fashion reporters off guard when she arrived on the red carpet at the 85th annual Academy Awards on Sunday.

The Devil Wears Prada star wore a pale pink satin Prada gown instead of what she was expected to wear, a custom dress made by Valentino. The Italian fashion house had sent out a press release ahead of the awards ceremony with a statement that Hathaway would be wearing one of their designs.

Hathaway told E! News host Ryan Seacrest that her dress was Prada and she "didn't know what she was wearing until three hours ago."

Hathaway later admitted that she decided against wearing a dress by her friend, Valentino, because she learned that another actress would be wearing a dress by him with a similar design. The gown was similiar to her Les Miserables co-star Amanda Seyfried's Alexander McQueen dress, according to Fashionista.com.

"It came to my attention late Saturday night that there would be a dress worn to the Oscars that is remarkably similar to the Valentino I had intended to wear, and so I decided it was best for all involved to change my plans," Hathaway told Women's Wear Daily in a statement.

"Though I love the dress I did wear, it was a difficult last-minute decision as I had so looked forward to wearing Valentino in honor of the deep and meaningful relationship I have enjoyed with the house and with Valentino himself. I deeply regret any disappointment caused," she added.

Hathaway has worn designs by Valentino for multiple occasions over the years. When she got married on Sept. 29 to her husband Adam Shulman at a private residence in Big Sur on the California coast, she wore custom wedding dress and veil designed by Valentino. 

The romantic wedding gown featured an off-the-shoulder neckline with a delicate lace texture and embroidery, which was seen in grainy photos taken at the weddingThe Dark Knight Rises star topped her pixie haircut with a dramatic veil that draped to the floor accented with a 1920's-inspired vintage headpiece. The stunning veil met the hemline of her floor-sweeping gown.

Unfortunately, Hathaway's Prada gown did not end up as well as she would have liked on Sunday at the 2013 Oscars. She experienced a wardrobe malfunction when her bust appeared more pronounced than usual because she did not wear a bra or nipple covers under her gown. Hathaway's nipples appeared more pronounced than usual under the thin satin fabric and quickly earned its own Twitter handle. One of her fans immediately created a Twitter handle dedicated to her nipples titled "@HathawayNipple."