For Spring 2012, international designers dipped their collections into every shade and vibrancy on the colour spectrum. Simply put, it's all about placing your favourite colours on blast. From ladylike pastel pinks at Rochas and powdery floral blues at Erdem, to electric greens at Jean-Paul Gaultier and soft lemon iterations spotted at Jason Wu, it's safe to say where there's colour, there's a way to wear it. We've rounded up the prettiest blues, reds, purples, and more to pop up on the runways and taken care to hone in on the coolest colour combos we've seen for the upcoming season. So when the time comes to put those chic, black, Winter pieces away — you'll have a head start on which rainbow-inspired shade you'll be donning for Spring.

While Kate Moss has been on her country farm making house, we've been missing her effervescent style. She was back on the scene this week for the Marie Curie Cancer Care fundraising dinner and looked amazing in a black gown and feathered cape. Emma Roberts looked as cute as a button (and made us miss Summer) out and about in denim shorts and flatform heels. Kristen Stewart got it so right at a publicity event for Snow White and the Huntsman wearing Derek Lam and Alexander McQueen — the dress was such a great cut for her figure. Click through to see who else made our top 10 this week — special mention goes to a daring Jaime King in a revealing Proenza Schouler ensemble!

The Cannes Film Festival is proving to be a fashion mecca for A-list starlets, and as we head into day four, it's safe to say official jury member Diane Kruger, Eva Longoria, and Freida Pinto have solidified their statuses as ultra-chic red carpet style setters. This star-studded crew — along with the likes of Shailene Woodley, Jessica Chastain, and Naomi Watts — have pulled out all the stops on their French Riviera panache for yesterday's Madagascar 3 festivities, as well as Calvin Klein's Women in Film party, L'Oréal's 15th anniversary dinner, and subsequent photocalls. With every film screening and luxe premiere, we're continually wowed with the onslaught of unstoppable glamour. From Diane's latest appearance in a lacy Jason Wu at the Haiti: Carnival benefit to Jessica Chastain's and Mia Wasikowska's fresh frocks for yesterday's Lawless photocall, these ladies show no signs of slowing. There's more where that came from — and since this is just the beginning of sunny celeb red-carpet style, be sure to keep checking our Cannes who-wore-what roundup for even more glamorous film fest appearances. Click the slideshow to see up-to-date Cannes Film Festival looks from all angles now.

There's no denying Kim Kardashian's strong commitment to looking gorgeous every time she steps out, but the outfits she's chosen for her appearances in London over the past few days have really taken things up a notch. Perhaps it's boyfriend Kanye West's designer-eye rubbing off on her, but we're predicting an new, edgier look for Kim. Her hair is noticeably shorter with a new blunt cut, and she's kept to a very classic colour palette of black, white, red and navy during her trip. With less bling, longer hemlines and very on-trend silhouettes, some of the labels Kim has been spotted in include Lanvin and Celine. Click through to see Kim rocking a new, very demure look. We love!

Hands up if you don't own a white shirt? No? Ok, then today marks a very charitable occasion to go out and invest in one at Witchery. One hundred percent of gross profits from the sale of every one of Witchery's specially designed white shirts goes to the Ovarian Cancer Research Foundation, a cause close to the hearts of Madison cover girls Jessica Gomes, Kristy Penn and Gail Elliott. The trio model the feel-good garments on the cover of the May issue, proving this is one fashion essential that truly transcends the age divide. From laid-back boyfriend styles to slick tuxedo tailoring, there's a shirt to suit every style MO. We're looking to invest in a new wardrobe staple, so called in the look book. It's hard to resist a spot of weekend shopping when it's for a good cause!