The ballerina bun is a classic style because it is effortless and shows off the natural beauty of a woman, according to TRESemmé celebrity stylist Jeanie Syfu.

But we can't help but wonder if "Black Swan" influenced the hairstyles seen on the Spring 2011 runways of Sophie Théallet, Rebecca Taylor, Adam and Tadashi Shoji, or if stars like Diane Kruger, Kirsten Dunst and Jennifer Lopez wanted to put their spin on Natalie Portman's bold bun.

Syfu admits that she hasn't noticed an upsurge in celebrities sporting knots since the ballet thriller hit theaters, however she does believe that the style has transformed over the decades. "There are many different versions -- messy, to the side, top of the head, with a pompadour or sleek. But it also has a lot to do with how styling products have evolved from the '50s and '60s when buns were over-styled and stiff."

So what's this pro's trick to perfecting a ballerina bun? Her secret lies in the setup.

"Before putting your hair up, always work some type of styling product in to create a strong foundation so your bun doesn't lose its structure. I find blow drying the hair in the direction of where you want the bun to sit allows for more control, whether it be a messy bun done with your fingers or a sleek bun using a flat boar bristle brush," says Syfu. "When gathering the hair into an elastic, make sure to keep your head upright to avoid a sagging bun at the nape of your neck."

Syfu's final words of advice: make the look personal.

"There's no right or wrong way to style it for day and night," she adds. "I would keep in mind what you are wearing and since this hairstyle is putting attention to your face, try to emphasize one feature like a pretty lip, groomed strong eyebrows, lightly contoured cheekbones or a sultry, smoky eye."

Click here to find out which summer hair trend has celebrities bursting at the seams! And try the look for a summer wedding, like Beth Jones of B. Jones Style.