Ready for some good news? Dig into that tub of Ben & Jerry's or buy yourself a Krispy Kreme. That dress doesn't make you look fat -- your brain does!

Scientists at University College London have found that a person's body image is "massively distorted" in their brain, measuring up to two-thirds wider than what their body looks like in reality. (The brain's "body model" is also about one-third shorter than the body really is.) So, you're not only thinner than you thought, but also taller.

The researchers believe their findings help explain body dysmorphia and eating disorders like anorexia. Dr. Michael Longo, the neuroscientist who led the research, told the Telegraph, "Some people look in the mirror and receive information which tells them they are not fat, but they still can't use that to override their distorted body model and make themselves believe it."

Just something to remember the next time you're boring your long-suffering boyfriend by asking him if he thinks your butt looks big in those jeans. For the thousandth time.