Krupa was born in Warsaw, Poland, the daughter of hotelier Steven Krupa. Joanna has a younger sister, Marta. She moved to Chicago, Illinois with her family at the age of five. Krupa has appeared on various magazine covers including FHM, Personal, Inside Sport, Stuff, Steppin' Out, Teeze, Maxim, in which she was named the Sexiest Swimsuit Model in the World. Maxim named her #61 in its 2006 Hot 100 list. She was also voted German Maxim's Model of the Year 2004-2005.
She posed nude in July 2005 issue of Playboy. She was a "Juggy Dancer" on The Man Show for a brief period of time. She enjoys playing poker and is currently the official spokesperson for Titan Poker, an online poker room.
Krupa also did a nude photoshoot for animal rights group PETA. The advertisements all have "I would rather go naked than wear fur" as a motto. Krupa has been quoted as saying, “There is nothing sexy about wearing something that is so obviously tied to senseless pain and killing.”
Krupa is releasing a calendar for 2008 in which she appears topless.
She was a Miss Howard TV model for the month of December 2007.
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