This week, the stars were giddy to share their favorite moments, from Michelle Dockery posing with Diddy  to Gwyneth Paltrow  sharing the Valentino dress that missed the Globes red carpet. Thanks to their social pics, we got a behind-the-scenes look into what makes our favorite celebrities shine. See the most shareable moments that made the stars' weeks, and follow POPSUGAR Fashion on Instagram , Facebook , and Twitter !
Oprah Winfrey  and Lupita Nyong'o smiled cheek to cheek backstage at the Critics' Choice Awards.
When Downton met Diddy .
Lena Dunham shared the time she posed with a pigeon for Vogue.
Hilary Duff  showed off these spiked Valentino stunners.
Rihanna  was ready to hit the road.
Bright prints banished Nicky Hilton 's Winter blues.
Jaime King and Taylor Swift  cozied up to a delectable box of chocolates for a girls' night in.
What do you wear to hang out with Purple Rain singer Prince? A purple coat, of course.
Shay Mitchell didn't hide her chic boating style when she sailed into the sunset on vacation in Kilifi, Kenya.
Gwyneth Paltrow  showed off the short and sexy Valentino dress that missed the Golden Globes red carpet.
These beige accessories are anything but boring.
The stars of Scandal reminded us that getting dressed up doesn't have to be a formal affair.
Midnight blue was the winning color for Mindy Kaling before the SAG Awards.
The magical scenery (and Jena Malone's Peter Pan collar) had us dreaming of Neverland.
Sarah Hyland showed off a seriously sparkling pinky ring at the SAG Awards.
This trendy trio — Jaime King, Tory Burch , and Jessica Alba  — seemed to have coordinated their outfits.
Oops! It looks like Heidi Klum  had some trouble keeping her fishnet tights together.
We could only think of candy dots when we saw Busy Philipps's bright Christian Louboutin  clutch.
These funny ladies showed off some serious style.
Beyoncé brought out the Sasha Fierceness in bright colors and dark shades.
What does 17th century underwear look like? Ashley Madekwe found out.
Elmo didn't have to dress up, but Ginnifer Goodwin  made sure to look effortlessly chic when posing with her Muppet friends.