It was a fun, festive week in the world of social media, and some of our fashionable favorites were sharing their stylish snaps during moments of work and play. Derek Blasberg celebrated his birthday with a bevy of beauties — Nicole Richie , Jessica Alba , Rachel Zoe , and Kirsten Dunst , to be exact — while Coco Rocha got glammed up for a fancy dinner in her honor. Poppy Delevingne shared photos before wrapping up her Coachella festivities, and Selena Gomez  had a pretty priceless reaction to a young fan's t-shirt.
Click through now to see the rest of this week's cutest celebrity candids, and don't forget to follow POPSUGAR Fashion on Instagram , Facebook , and Twitter !
Lauren Conrad  snapped a sunny selfie in a pretty collared shirt.
Nicole Richie  showed off a gorgeous blue embellished dress before her appearance on Chelsea Lately.
Rihanna  sported a leather skirt and backward baseball cap while posing next to a piece of art.
Jessica Stam blew out the candles on her birthday cupcakes.
Coco Rocha wore her favorite Dannijo  earrings on the way to dinner.
Vanessa Hudgens  enjoyed the Coachella sunset in a chic bohemian outfit.
Derek Blasberg was joined by a stylish group of celebrity friends while celebrating his birthday — the party included guests Kirsten Dunst , Kelly Sawyer, Nicole Richie , Jessica Alba , and Rachel Zoe .
Ciara showed off a crisp all-white Givenchy  ensemble.
Poppy Delevingne worked a Native American-inspired look while partying at Coachella.
Clémence Poésy rocked a sleek jacket and wool hat while in Venice, Italy with Derek Blasberg.
Coco Rocha checked herself out at James Houston's Natural Beauty exhibit in NYC.
Selena Gomez  had a hilarious reaction to a young fan's t-shirt.
Julianne Hough promoted the Element 4 Kind campaign with her printed t-shirt.
Diane von Furstenberg  posed for adorable photos with little girls to promote her DVF Loves Gap collection.
Poppy Delevingne partied in style with Sienna Miller .
Ellie Goulding showed off a cool pair of printed leggings.
Alexa Chung showed off her stems in a minidress on the set of Fuse News.
Emma Roberts slept with her Gwyneth Paltrow-covered issue of Harper's Bazaar.
Cat Deeley sported a gold metallic blazer.
Jaime King popped out of a birthday cake on the set of Hart of Dixie.
Natasha Poly enjoyed a bowl of strawberries in the sun.
Rachel Roy  celebrated Earth Day in a cool peace sign tank top and gold collar necklace.
Jessica Alba  got to meet New Order's Bernard Sumner at Coachella.
Poppy Delevingne and Julia Restoin Roitfeld had some girl time together.
Selita Ebanks showed off a chic pair of cat-eye sunglasses.
Chrissy Teigen got the vampire treatment during a day at Universal Studios.
Jessica Alba  and Kelly Sawyer helped Derek Blasberg celebrate his birthday.
Selena Gomez  wore a floral 3.1 Phillip Lim  ensemble to hang with radio show host Elvis Duran.
Rebecca Minkoff  posed with one of her cool clutches during a Nordstrom  in-store appearance.
Olivia Palermo and Johannes Huebl posed together before heading to the Louis Vuitton  store opening in Germany.
Christy Turlington ran into fellow model Petra Nemcova while doing charity work in Haiti.
Bar Refaeli  posed with pretty tulips while in NYC.
Rachel Zoe  and Joey Maalouf wore matching fedoras and sunglasses during a road trip.
Nicole Richie  helped celebrate Derek Blasberg's birthday.
Brad Goreski and Ryan Seacrest  posed back-to-back in matching black outfits.
Rachel Zoe  and Amanda de Cadenet were on hand to celebrate Jennifer Meyer 's birthday.
Bar Refaeli  popped bubbles on the set.
Miley Cyrus  blew a red-lipped kiss to her followers.
Natasha Poly snapped a photo of her pitch-perfect airport style while traveling to Moscow.