David Letterman unveiled this year's winner for "Sports Illustrated's 2011 Swimsuit Edition" on "The Late Show."  25-year old Russian model Irina Shayk is this year's winner as well as the cover model.  This is Shayk's first cover and fifth appearance in the magazine's swimsuit issue.

Shayk said last night's announcement came as a total surprise, and she immediately called her mother and sister in Russia to share the news (in Russian of course).  If you have never seen Irina Shayk you could probably say she looks like a less trashy, better looking Angelina Jolie -- tall, long light brown hair, big lips and pronounced cheek bones (just my opinion).  Then again tall and beautiful is describing any model for the most part.

Here are just a few pictures of Irina.