Never has one dress sparked so much debate. The colour of a lace bodycon dress has got millions talking all over the world, and now celebrities including Kim Kardashian, Blake Lively and Taylor Swift have joined the debate on what hue the garment is.
While some users see it as white and gold, others argue that the dress is actually blue and black.
The picture of the dress was initially posted on Tumblr by 21-year-old Caitlin McNeill, who wrote: "What happened was two of my close friends were actually getting married and the mother of the bride took a photo of the dress to send to her daughter.
Blake Lively joined the debate on Instagram
"When my friend showed the dress to her fiancée, they disagreed on the color."
Caitlin's post was shared on Tumblr before going viral and becoming a trending topic on Twitter, leading many stars to share their views on what colour the dress is.
Kim Kardashian revealed that she and Kanye West disagreed on the subject.
"What color is that dress? I see white & gold. Kanye sees black & blue, who is color blind?" she tweeted.
Meanwhile Taylor Swift joked that she was "confused and scared" by the dress debate, telling fans: "I don't understand this odd dress debate and I feel like it's a trick somehow. I'm confused and scared. PS it's OBVIOUSLY BLUE AND BLACK".
New mother Blake Lively also joined the debate on Instagram, writing: "My mind is blown. What do you guys see?? Is this dress blue and black, or white and gold?"
Oscar-winning actress Julianne Moore even joined the debate, tweeting to comedienne Mindy Kaling that the dress is in fact white and gold. Cheryl Cole agreed, and shared a picture on Instagram with the caption: "This is WHITE AND GOLDDDDD!!!"
Other stars to have their say included Demi Lovato, Miley Cyrus and Anna Kendrick who wrote: "If that's not White and Gold the universe is falling apart. Seriously what is happening????"
However the dress is actually described as "Royal Blue" by Roman Originals, who sell the dress.
Scientists explain that the reason why some people see white and gold instead of blue and black is because the picture is an optical illusion.
Roman Originals describe the dress as royal blue
The brain determines the colour of an object by filtering out backgrounds and lighting– so colour is perceived in relation to the items surrounding it.
In the case of "the dress", the background colours are so mixed up that it confuses the brain about the colour of the dress itself.
Have your say – what colour do you see #TheDress as?