It's time for another round-up of fashion's biggest stories (and rumours), today featuring Beyonce's impossible bod, a preppy designer / high street collab, and news of a very exciting return to fashion from one of our favourite designers...

luella bartley head shoulders shot.jpgLuella Bartley is making her long overdue return to the world of fashion, joining Katie Hillier at Marc by Marc Jacobs. The duo will head up the label, giving Marc himself more time to focus on Louis Vuitton and the main Marc Jacobs line. [Vogue UK]

Michelle 'Milly' Smith has designed a capsule collection of Summer dresses, separates and chic accessories for Banana Republic. The colourful collection is described as being inspired by 'summertime in the Hamptons' and features plenty of colourblock maxis and modern prints. [Shop Now]

The prosecutor in Domenico Dolce & Stefano Gabbana's tax evasion trial is apparently pushing heavily for jail time for the designers. The duo - who deny the charges - have already paid a huge fine, but they may also face up to five years in prison, alongside colleagues including their accountant and finance director. [Fashionista]

Model of the moment Cara Delevingne has lent her excellent eyebrows and grungy aesthetic to the latest Saint Laurent campaign. It's all very Reality Bites - slouchy floral dress, check! Clunky ankle boots, check! [Refinery 29]

Rumour has it Beyonce requested that all airbrushing on her H&M campaign photos was removed, to ensure the pictures were the real deal. The original photos submitted to the star showed her slimmed-down, but Bey's team refused to sign them off. More of this, please! [Telegraph]