Kate, in fourth place, is a newcomer on the coveted annual list, and ranks higher than her sister Pippa Middleton, who is 47th. The British royal is praised for her “classic elegance” which has “set the high street alight”.
Harry Potter star and Burberry model Emma Watson slipped from top spot in 2011 to second place in Glamour magazine’s top 50.
Singer and former X Factor judge Cheryl Cole dropped from second to eighth, but the magazine said the pop star had the “fashion factor nailed”.
Spice Girl turned designer Beckham has shot-up 12 places to third, with the magazine praising the “adorable co-ordinating looks” she shares with “her new favourite accessory” — baby daughter Harper.
This year’s top 10 is completed by flame-haired singer Florence Welch (fifth), Marilyn Monroe actress Michelle Williams (sixth), Gossip Girl actress Blake Lively (seventh), US socialite and reality TV star Olivia Palermo (ninth) and chart star Rihanna (10th).