Dianna, was born in Savannah, Georgia, and raised in San Francisco. Her father is Russian, and their family name was originally Agronsky before it was shortened by Ellis Island officials. She did musical theater throughout school since being cast as Dorothy in "The Wizard of Oz" in 5th grade, and grew up loving musical films like "Funny Face" and "Singin’ in the Rain." She started ballet classes when she was 3 and by her teen years she was teaching dance classes. Because of her dance background, she got used to rejection at an early age. She saved up money from teaching dance classes to move to Los Angeles.
Dianna is best known for playing cheerleader Quinn on "Glee," which won the Golden Globe for Best Comedy Series. .
Dianna is a vegan.
Dianna is a PETA supporter.