We spotted Kim Kardashian at Miami International Airport catching a flight to London with her sister Kourtney and her children, Mason and Penelope.

The reality star really overdid it in leather. She wore black thigh-high leather boots and a leather trench coat. She also carried a black leather purse.

Kim is a big fan of the material. Last week she stepped out with boyfriend Kanye West in a black sequined mesh blouse and leather pants.

Maybe next week we'll see the "Keeping Up With The Kardashians" star in a leather biker jacket.

See more photos of Kim...