OnlyOnAOL: The top five crazy-cool headpieces at the Met Ball

By: Donna Freydkin

Boring is banned on fashion's biggest night.

"For the Met Ball, it's about fashion and anything goes," says celebrity makeup artist Nick Barose.

Every year, the Met Ball, which takes place the first Monday in May, has a theme. And this year's is Manus x Machina: Fashion in an Age of Technology. All the proceeds benefit the Metropolitan Museum of Art's Anna Wintour Costume Center. (See our interview with superstar stylist Rachel Zoe above).

Some stars bring it. And others -- well, they're on a whole other level. And our favorite, when it comes to going all out, is Sarah Jessica Parker, the queen of Philip Treacy's outlandish, extravagant headgear.

Here she is at the gala in honor of China: Through the Looking Glass, in 2015, in an an H&M dress.

And she brings the wow factor again in 2013, this time following the theme of Punk: Chaos to Couture in a Giles gown.

Selena Gomez turned on the flower power at the 2015 fete in Vera Wang.

Model Karen Elson dazzles in 2015 at the China: Through The Looking Glass event in Dolce & Gabbana.

And we'd be remiss without spotlighting Rihanna, who really knocked it out of the proverbial park with her dramatic arrival in 2015. She won the night in Chinese couturier Guo Pei.

Here's a look back at Met Ball looks.