This week in celebrity beauty Instagrams, we saw stars get ready for red carpets, runways shows, and Sundance premieres. Though temperatures are freezing in most places, these A-listers managed to look hot (thanks to a little help from their friends ). Some highlights: Alexa Chung's Spring-ready floral nail art, January Jones 's backstage beauty shot, and Joan Smalls's stunning cat-eye liner. See more of our favorite filtered photos, and don't forget to keep up with our editors by following POPSUGAR Beauty on Instagram !
Sparkles and spikes made for a fierce manicure on Ashley Benson.
Andy Lecompte worked his hairdresser magic on the fashion designer's beach waves.
The It Brit showed off a darling daisy manicure. Someone has an early case of Spring fever.
The actress prepared to get pretty in pink.
Hollywood's funny lady proved you can match your nails to your accessories — even when glitter is involved.
It was selfie time for Karlie and makeup artist Pat McGrath backstage at the Atelier  Versace  Haute Couture Spring 2014 show.
Cara Delevingne and Lindsey Wixson
Before the Chanel Haute Couture Spring 2014 catwalk , the models (and social media stars) gave a glimpse of that epic club-kid glitter eyeliner and ultramessy bed head.
As the megamodel prepared to walk the Haute Couture runways, she gave us a peep of her dreamy cat eye and flawless skin. Saturday-night inspiration, anyone?
On Wednesdays, we wear pink pouts . . . if you're friends with Hilary Rhoda.
A black-and-white palette is anything but boring when you colorblock it like Karolina did.
January took her first-ever Instagram snapshot from the beauty chair. Look at the va-va-volume!
Hairstylist Christian Marc made sure Diane was red-carpet-ready with a soft updo, which was just one of the amazing beauty looks at the Sundance Film Festival .
Before celebrating Michelle Obama's birthday, Beyoncé relied on makeup artist Sir John for a touch-up .
The beauty brand had us dreaming of Spring (and tropical islands!) with the vibrant new Nars collection  in this shot.
Bold-lip queen Lupita tried a burgundy hue on for size.
The on-set makeup was a little bloodier than usual for Emma.
Those bangs! Lea Michele  teased Glee's 100th episode with a look at her sleekly styled locks.
Jessica smiled in a bright red lip as she soaked up the snowy weather.