When you think of occasions to let your sexy side out this Summer, music festivals and happy hour cocktails might be the first events that come to mind. But we bet you didn't associate that sort of sultry seasonal dressing with garden parties and polo matches. Thankfully, fashion-forward attendees like Amber Heard and Lupita Nyong'o were happy to defy convention this week and set a new standard for sexy Summer dressing.

Whether it was with bold hues, deep plunges, or midriff-baring silhouettes (because now that you have a tan, why not flaunt it?), stars like Emma Roberts, Alexa Chung, and Beyoncé were setting a new bar. See all the looks we loved on some very chic ladies.

Source: Billy Farrell Agency [1]

Alexa Chung

At the Glamour Women of the Year Awards, Alexa Chung's modest Dior LBD had an alluring surprise: a sheer bodice. And those sandals? It just doesn't get much sexier!

Emma Roberts

When in Maui . . . Emma Roberts got into the Hawaiian spirit at the Maui Film Festival by baring plenty of tanned flesh in Catherine Malandrino's white crop top and pencil skirt.

Amber Heard

Amber Heard stopped by Stella McCartney's garden party in the designer's stringy, slinky cocktail dress.

Beyoncé

Beyoncé looked seriously hot for a seriously important cause when she stopped by the Chime For Change anniversary party in a plunging jumpsuit.

Blake Lively

Blake Lively [2] took a page from Beyoncé's book and wore an equally seductive neckline to the same event.

Carrie Underwood

Many people associate country music with sparkle and shine, but Carrie Underwood [3] went a different route when she arrived to this year's CMT Music Awards in her printed gown. And though there wasn't a sequin to be found, this skin-baring dress was plenty flashy.

Lupita Nyong'o

What a classic! Lupita Nyong'o caught our eye at the Veuve Clicquot Polo Classic in Alexander McQueen's sophisticated take on the sundress, which she complemented with dramatic extras including a straw hat and strappy sandals.

Emmy Rossum

Just because she wore a gown to the CFDA Awards didn't mean Emmy Rossum couldn't find a way to show some skin.

Sandra Bullock

At the AFI event, a seductive cutout and hue scored Sandra Bullock [4]'s Vionnet gown bonus points with us.

Marion Cotillard

We couldn't help but get romanced by Marion Cotillard's airy, white Christian Dior shift at the CFDA Awards.