Oscar Winner, Olympic Medalists Targeted by Hacker

3/21/2011 9:50 AM PDT

Oscar Winner, Olympic Medalists Targeted by Hacker

The growing list of celebs targeted by a hacker ring now includes the names of an Academy Award winning actress and two gold medal winning Olympians ... TMZ has learned.

Sources connected to the hackers tell TMZ ... Natalie Portman (Oscar winner for "Black Swan"), Lindsey Vonn (Gold medal skier in 2010), and Carly Patterson (all-around Gold in gymnastics in 2004) are all among the women who have been targeted by a ring of hackers who have gained access to over 100 active email addresses of celebrities, politicians and sports stars.

We're also told Dianna Agron from "Glee" has been targeted as well. And a prominent 17-year-old actress was also hacked ...  though we're not releasing her name.

As TMZ first reported, the hackers have snagged nude photos from many female stars, including  Vanessa Hudgens, Ali Larter, Busy Philipps, Scarlett Johansson, Miley Cyrus, Jessica Alba, Addison Timlin and Renee Olstead.

We're told the FBI knows the identity of the ringleader ... but no arrests have been made so far.