The Harry Potter actress, who is famous for her quirky dress sense, opted for the unusual creation at the Elle Style Awards, held in central London.
The dress was a combination of sequins, bows and ruffles, with white detail in the skirt and teamed with a pair of black stilettos.
Twitter went wild as Emma made her red carper appearance, with fans praising her out-there dress sense.
Speaking about her love for fashion, the 23-year-old has admitted it's helped her shed her Harry Potter image.
In an interview in 2012, she said: "Fashion gave me a chance to feel like I was something outside of Potter.
"I'm a multidimensional person and that's the freedom of fashion: that you're able to reinvent yourself through how you dress and how you cut your hair or whatever."