Katheryn was born December 17, 1977 in Etobicoke, Canada. Her parent immigrated from Ukraine. Her original name is Katerena Anna Vinitska. She was guest-starring in many TV series. In 2014, Winnick has main role on TV show Vikings – starring as Lagertha. Her most recent films include Love & Other Drugs, Stand Up Guys, and The Art of the Steal.