Dianna Agron was born in Savannah, Georgia to Ronald S. and Mary Agron. She was raised in San Francisco. Her family is originally from Russia. Her father is Jewish and her mother converted to Judaism. She attended high school at Burlingame High School in California.
Dianna has had roles on many TV shows such as: Shark, Close to Home, CSI: NY, Numb3rs, and landed recurring roles on Veronica Mars and Heroes. She also appeared as Harper on a 13-episode series of short films called It's a Mall World.
She was among many young Hollywood stars selected to be in Wal-Mart's Ocean Pacific spring 2010 marketing campaign. She is also a fervent supporter of animal rights and devotes herself to vegetarians. In 2009, she landed a role on Fox's Glee as Quinn Fabray. She also recently directed the music video for "Body" by Thao with the Get Down Stay Down.
In 2010, Agron played Natalie, girlfriend to main character Ali's love interest Jack, in the movie Burlesque. She also stars alongside Alex Pettyfer and Timothy Olyphant in the 2011 film, I Am Number Four.
She and Alex Pettyfer dated for some time after meeting on set of the film, and after engagement rumors surfaced, they reportedly broke up soon after.