In 2005, Kelly landed a three-episode recurring role on The WB comedy series What I Like About You.
In April 2006, Kelly was cast as a series regular on the NBC drama series Friday Night Lights.
A spokesperson for Kelly confirmed the news, but gave no reason for the split. “They care about each other, and it was amicable,” said a source.
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Kelly also appeared in the pilot for the short-lived CBS ensemble comedy series Mad Love playing the role of Kate, a Midwestern girl who falls in love with Henry at the top of the Empire State Building.
When the show was picked up, Kelly was replaced by Sarah Chalke.
In December 2010, ABC announced that Kelly was cast in the planned reboot of the crime drama Charlie's Angels. The pilot was filmed in March 2011 and the series was picked up on May 13, 2011.
In August 2008, Kelly was cast as the protagonist in The CW pilot Body Politic.
She is most known for her roles in the television shows Friday Night Lights (2006–2009), Parenthood (2010–2011), Charlie's Angels (2011), and Almost Human (2013).
While on a test shoot for a modeling agency, she was approached by a former Playboy Playmate who was interested in managing her, and who placed Kelly as a receptionist at a surgeon's office who would provide Kelly breast augmentation in exchange for hours worked.
The show, based on the high school football film of the same name, follows a high school football team in the fictional small town of Dillon.
Kelly played the role of high school student and cheerleader Lyla Garrity.