Ritter gained wide recognition as Jane Margolis in the AMC drama series Breaking Bad (2009–2010), a role she reprised in the film El Camino (2019). She also earned praise for her portrayal of Chloe in the ABC sitcom Don't Trust the B---- in Apartment 23 (2012–2013).
Ritter appeared in the television series Veronica Mars, Gilmore Girls, 'Til Death, and Gravity. She starred in the films What Happens in Vegas (2008), Confessions of a Shopaholic (2009), She's Out of My League (2010), Veronica Mars (2014), Big Eyes (2014), and The Hero (2017).credit: third party image reference
Ritter was born in Bloomsburg, Pennsylvania, the daughter of Garry Ritter and Kathi Taylor. She was raised in rural Shickshinny, Pennsylvania, where her mother, stepfather and sister live; her father lives in nearby Benton. She is of German, Scottish, and English descent. She graduated from Northwest Area High School in 2000.
Ritter was scouted by a modeling agent at her local shopping mall, the Wyoming Valley Mall, at the age of 15, at a modeling event. Ritter says she was "tall, gawky, awkward, and really, really skinny" to Philadelphia Style magazine. While in high school, she traveled to New York City, modeling there and in Philadelphia. She signed with the Elite Model Management agency and Wilhelmina Models. Ritter moved to New York City, and established an international-modeling career in print ads and on television. She did magazine, catalog, and runway work in Milan, New York, Paris, and Tokyo.
Ritter's acting career began after Wilhelmina placed her for an audition for a Dr Pepper television commercial. Ritter told Philadelphia Style her "outgoing and bubbly and funny" personality as a performer helped her transition into acting by entertaining the casting people. She won several bit film roles starting in 2001, then played a 1950s art history student in Mona Lisa Smile (2003). In 2006, she appeared in All This Intimacy, a two-act, Off-Broadway play by Rajiv Joseph, at the Second Stage Theatre. Ritter signed on to star in the premiere of Zach Braff's play, All New People, at Second Stage Theatre. Anna Camp, David Wilson Barnes and Justin Bartha co-starred in the production under the direction of Peter DuBois.credit: third party image reference
Ritter portrayed guest roles on television, and appeared on the second season of Veronica Mars, playing Gia Goodman, the daughter of mayor Woody Goodman (Steve Guttenberg). Ritter was on Gilmore Girls for eight episodes 2006-07 as Rory Gilmore's friend, Lucy. She also played the first iteration of Allison Stark on the Fox sitcom 'Til Death (it eventually had four actresses play that role through its run).Ritter continued working in film, often cast as the best friend of the lead character. In 2008, she had supporting roles in the romantic comedies What Happens in Vegas and 27 Dresses. She co-starred in the 2009 film Confessions of a Shopaholic as Suze, the best friend of Isla Fisher's character. Ritter spent three months shooting She's Out of My League in Pittsburgh in 2008. She played Patty, the cynical best friend of Alice Eve's character Molly.Ritter was cast as a young Carol Rhodes in an episode of The CW's teen drama series Gossip Girl titled "Valley Girls" broadcast May 11, 2009. The episode was a backdoor pilot for a proposed spin-off series of the same title, set in 1980s Los Angeles; it was intended to chronicle the teenage years of the character Lily van der Woodsen. Ritter described her character Carol, Lily's sister, as "the outcast", and "an '80s Sunset Strip rocker" to Access Hollywood. The series was not picked up by the network for the 2009–10 season.credit: third party image reference
Ritter appeared as the character Jane Margolis on the second season of AMC's drama series Breaking Bad, and starred in the film How to Make Love to a Woman (2009), based on a best-selling book by adult film star Jenna Jameson. She also co-starred with Jason Behr in the independent film The Last International Playboy (2009), as Ozzy, a drug addict. Ritter sold a television pilot she wrote based on her experiences as a model, named Model Camp. She appeared in the comedy web series Woke Up Dead in 2009, playing Cassie alongside Jon Heder as Drex.