Oprah Winfrey opens her first retail store in the US

It's already been dubbed the O-Mart.

Chat show queen Oprah Winfrey has opened her first retail store in the US.

The 5,500 square-foot shop, in the heart of Chicago, features hundreds of items representing her style.

It is filled with inspirational and informative books, comfortable clothes and goods bearing Winfrey's trademark "O" - including velour tracksuits with the "O" zipper. Among the book on sale are titles by poet Maya Angelou and diet doctor Mehmet Oz.

"It's a specialty store full of merchandise that represents the style and taste Oprah celebrates and shares on 'The Oprah Winfrey Show,' " her publicist said in a statement.

"The interior was created to evoke a loft-like urban feel with exposed ceiling along with the extensive use of bamboo wood, brushed metals and green chocolate-flaked marble."

According to the Chicago Sun-Times, the most popular items at The Oprah Store when it opened on Thursday were $13 cosmetics bags decorated with blue, yellow, pink and purple Os - with at least 70 sold.

Shoppers can also pick up an $8 handmade keychain or buy a pair of $300 crocodile boots.

The approximately 900 products in the shop - near the star's Harpo Studios - include souvenirs, "lounge, workout and luxury apparel; O Baby: a signature line of baby products; and select South African arts and crafts," according to a statement.