It was a pretty eventful week in the world of celebrity social media — some of fashion's finest rubbed elbows at the Cannes Film Festival, snapping gorgeous, glamorous shots to share with their fans, while others hung out with stylish pals closer to home. Rosie Huntington-Whiteley and Karlie Kloss gave us a glimpse of their breathtaking views in the South of France, while Stella McCartney partied with Kate Moss in Hong Kong. Julia Restoin-Roitfeld celebrated her daughter Romy's first birthday in bunny ears, and Izabel Goulart was on hand for a sexy photo shoot. Meanwhile, Emmy Rossum showed off her sultry look for the Billboard Music Awards, Lauren Conrad put a bow on it, and one hot model got some new ink.

Click through now to see the rest of this week's cutest celebrity candids, and don't forget to follow POPSUGAR Style on Instagram, Facebook, and Twitter!

The Mrs. Carter World Tour is shaping up to be quite the fashionable affair. On top of Beyoncé's custom costumes, designed by the likes of Kenzo, Emilio Pucci, and Givenchy — and her tour's eponymous line of concert-inspired tees — Rent the Runway is honoring her tour by debuting a boutique of dresses and accessories, specially curated by Beyoncé herself. Dresses by Nanette Lepore, Moschino, Versace, and Erin Fetherston — just to name a few — and a colorful lineup of sparkling baubles have all become Beyoncé-approved must-have items to style the perfect night out. Shop the entire selection online, and see our favorite items from the boutique, here in the gallery.

As Cannes keeps rolling on, the stunning pictures keep pouring in. On par with Cannes past, this season's stylish set kicked off the glamour Gatsby-style with the film's premiere on day one, and continued to wow with every subsequent premiere and party. The latest event is amfAR's Cinema Against AIDS gala, which gathered the likes of Jessica Chastain, Olivia Palermo, Karolina Kurkova, and many more stunning models and actresses. It doesn't stop there; inside you'll find every Cannes appearance so far, so just keep clicking — and stay tuned for all the red carpet action right here.

The latest batch of designer collaborations has us plotting all the ways we can style these ingenious seasonal matchups. From the high-low partnerships to the unexpected duos to the capsules that continue to reinvent the wheel (hello, Charlotte Olympia x Tom Binns!), this Spring's — and Summer's — most exciting collaborations promise to supply us with our fair share of warm-weather-perfect pieces. Think quirky zebra-head prints à la Peter Som for Anthropologie, cool-girl sandals courtesy of the third annual J.Crew x CFDA/Vogue Fashion Fund partnership, and vintage-inspired swimwear staples with a twist, courtesy of another J.Crew collaboration, this one with Pret-à-Surf. Click on to see all this, plus all the other designer collaborations we're excited to get our hands on.