If last night's celeb-filled Met Gala is any indication of the trends to come this summer, it's time to stock up on hair accessories.

The red carpet for the annual Costume Institute Gala at The Metropolitan Museum of Art (this year's theme paid tribute to the late designer Alexander McQueen) hosted a slew of hair accessory styles. Some were elegant (we loved Stella McCartney's [pictured below] vintage Cartier piece), some here boho-beautiful (Jessica Alba's [pictured below] mini tiara added polish to her baby bump),and some could have been mistaken for royal wedding castoffs (we're looking at you, Demi Moore [pictured below]). After pouring over photos, here are the four main categories of hair accessory looks we spotted last night.

Funky Fascinators Serena Williams [pictured below], international Vogue editrix Anna Dello Russo [pictured below], and Demi all went bold with larger-than-life feather and lace contraptions to anchor their avant garde looks. Perhaps these fashionistas were inspired by McQueen (he was no stranger to haute hats), but our new rule on fascinators is as follows: if you're not British or you're not in the UK, think twice before before sincerely rocking a large head piece stateside.

Bohemian Rhapsody Isabel Lucas (pictured above), Jessica Alba, Elettra Wiedemann [pictured below] (whose post-modern tiara was the perfect accent to grandmother Ingrid Bergman's dress), and Fergie [pictured below] all chose goddess-esque pieces to complement their gowns and tousled waves. While Lucas is clearly channeling a god-of-war-type with her metal head dress, we wish Fergie had cleaned up her curls when attending a black tie event.

Art Deco Rashida Jones, Stella McCartney, Shalom Harlow [pictured below], Vera Wang [pictured below], and Daphne Guinness [pictured below] chose delicate, jeweled pieces to show case their bouffants and shiny strands. From crystals to diamonds, these sparkly styles provide the perfect amount of old Hollywood glamour. But for DIY stylists at home, remember to use hairspray and extra pins to secure these heavier barrettes. They might look dainty, but metal and stone accents can be heavy and slip out of place.

Curious Crowns Both Kate Hudson [pictured below] and Naomi Campbell [pictured below] chose to place their singular baubles at the apex of their heads—and the effect is...disconcerting. Learn from these two normally-super-stylish ladies and hold off on front-and-center hair accessory placement unless that clip or barrette is holding back a section of hair essential to the look.