Kim Kardashian's Vogue cover among best-sellers

Kim Kardashian's controversial Vogue cover is flying off the shelves.

While the fashion bible has been criticised by some - including actress Sarah Michelle Gellar - for putting the reality TV star on its April 2014 cover, along with her rapper fiancé Kanye West, the issue is selling "on par" with best-selling past editions featuring Beyonce and US First Lady Michelle Obama.