Butts are beautiful, and they've always been a big topic of conversation. But throughout time, they've changed quite a bit. Right now? Big bottoms are in the spotlight. However, the idea of what an "ideal body" entails seems to leave society constantly trying to keep up. Is that really a good thing? While it's important to celebrate the importance curves are having in today's world, it's also necessary to note how well society does at letting us know what is the right body type to have. If you're skinny, something must be wrong with you, and if you're curvy, you're too big. Then there's the issue of race. A woman of colour had never been on the cover of a magazine until Beverly Johnson appeared on Vogue in 1974. People freaked out over Nicki Minaj's cover of "Anaconda" last year, but celebrated the models in thongs gracing the cover of Sports Illustrated. Plain and simple ... it's hard to keep up. What if one day "ideal" simply meant being blessed with the body you were born with? Here are 11 examples of how the "ideal" butt has changed.Thanks to the illustrations of Charles Gibson, the ideal butt in the 1900s was part of the lovely all-over hourglass shape he depicted. The "Gibson Girl" came to be as a result of these images.Fashion trends like mini skirts emerged during this time and rail skinny frames were in. Twiggy is an example of the type of body that was envied during this era.The 1970s welcomes Farrah Fawcett. Due to the powerful ladies of "Charlie's Angel" butts were meant to look fit with just a bit of womanly curve to them. Still, the '70s called for lean bodies. Also during this time was the rise of black pride, which resulted in Beverly Johnson landing the cover of Vogue, making history as the first black female to do so.It didn't matter if they were small and flat or round and big. If there was a supermodel flaunting her backside, it was desirable. There was the heroin chic look of Kate Moss and Elle Macpherson, and the round yet small booties of Cindy Crawford and Naomi Campbell. It was in the '90s that women of colour got to flaunt their stuff as well. Model Tyra Banks became the first black female on the cover of Sports Illustrated, JLo became envied for her curvy figure, and "Baby Got Back" was all the rage in 1992.