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Deacon is British, just like Pippa, and grew up in the Lake District of England (the same place where James Matthews popped the question last July!). He studied at London's famed Central St Martins design school, with some equally well-known classmates: Alexander McQueen and Luella Bartley. Here, Kate Beckinsale wears one of his creations at a 2016 event.
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Before setting off on his own, Deacon honed his skills at other major fashion houses. After starting his career at Jean-Charles de Castelbajac, he went on to design for Bottega Veneta, where he eventually became the head designer. Sarah Jessica Parker wore one of his designs (with an elaborate head piece!) to the Met Gala in 2013.
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After Bottega Veneta was purchased and another head designer replaced Deacon, Tom Ford hired him to work on womenswear for Gucci. However, after he fell ill with an infected saliva gland, he was forced to leave the Italian fashion house after just one season. In 2012, Glee star Dianna Agron wore a red Deacon dress to the Golden Globes.
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Deacon launched his own label, GILES, in 2003. His first collection, which hit runways in February 2004 at London Fashion Week, was a smash success (and featured models like Lily Cole and Linda Evangelista.) He went on to be named British Designer of the Year in 2006. He's best known for his use of busy prints and his diverse, wide range of designs.
For the closing ceremonies of the 2012 London Olympics, Victoria Beckham wore a Giles Deacon dress (with a massive train!) while performing with the Spice Girls.
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His work isn't the only aspect of his life that is high profile. Deacon been in a relationship with Game of Thrones star Gwendoline Christie for over four years. The actress wore one of his creations to the London premiere of Star Wars: The Force Awakens in 2015.
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He hasn't always been high fashion: Deacon has designed a more budget-friendly collaboration with British high street retailer New Look in the late aughts. However, now, GILES no longer offers ready-to-wear, and focuses solely on showing haute couture designs (meaning you'll be hard-pressed to find them on a store's rack), like this floral number that Kate Hudson wore to the 2015 InStyle Awards.
A perfect fit for a famous bride!