The best-dressed this week ​wore a mix of​ classic LBDs, vibrant hues and summery prints. The ones who failed​ chose oddly-accessorized ensembles or took a more vulgar route, opting for body hugging dresses and sheer separates.

For the Mexico City premiere of “Sex Tape,”

the leggy actress

went back to the basics, donning an LBD by Saint Laurent, proving black never goes out of style.

The more

fashionable Fanning

killed it on the red carpet, wearing a poppy floral design by Christopher Kane at an event for “The Boxtrolls” at Comic-Con in San Diego.

The beautiful Victoria’s Secret model wore head-to-toe florals, both by Escada, to the launch of the design house’s new Joyful fragrance in Munich.

The

“Orange Is the New Black” actress

traded in her orange jumpsuit for a colorblock dress by Roland Mouret at SiriusXM in NYC.

For the “Guardians of the Galaxy” screening in NYC,

the pregnant actress

kept it simple in a structured Lanvin dress.

Hmmm . . . what? Colbie Caillat hit the wrong note at the 2014 Young Hollywood Awards in Los Angeles, wearing a befuddling mix of menswear with a boho vibe. Color us confused!

At the America’s Got Talent Season 9 premiere, it seemed that Heidi Klum finally realized it’s no longer age-appropriate to wear uber-short dresses — but does that make it OK to wear big hoop earrings and a long, ill-fitting “club” dress?

Jena Malone

Kelly Osbourne