Her net worth reached $1bn (£720m) thanks to her cosmetics and clothing interests as well as income from TV, endorsement deals and investments, Forbes business magazine says.
She is now one of the 2,755 figures on Forbes' World's Billionaires List.
Amazon founder Jeff Bezos leads the pack with a net worth of $177bn.
Other Americans added over the past year include Bumble dating app founder Whitney Wolfe Herd ($1.3bn), filmmaker Tyler Perry ($1bn) and Miriam Adelson ($38.2bn), widow of casino magnate Sheldon Adelson.
Kim Kardashian West's estranged husband Kanye West is already on the list($1.8bn) but her half-sister, Kylie Jenner, was removed last May by Forbes. The magazine alleged her family had inflated the value of her cosmetics business.