Title: Penny (The Big Bang Theory)
Content:  Penny Hofstadter is a fictional character from the American CBS sitcom The Big Bang Theory, portrayed by actress Kaley Cuoco. She is the primary female character in the series, befriending her across-the-hall neighbors Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons), two physicists who work at the nearby California Institute of Technology (Caltech). Penny's lack of advanced education sets her apart from the group, but her outgoing personality and social aptitude drastically contrasts with the personalities of the primary male characters in the series, so she is considered "one of them". She is the primary love interest of Leonard, with whom she maintains a brief romantic relationship during the third season, which is later resumed in the fifth season and culminates in an engagement at the end of the seventh season and their wedding at the start of season 9.
Title: Penny (The Big Bang Theory)
Content:  In the original, unaired pilot of the series, the conception of the female lead was very different. She was called Katie, and was envisioned as "a street-hardened, tough-as-nails woman with a vulnerable interior". Sheldon and Leonard would "approach her with honesty, to draw the real, sensitive Katie out". The role was played by Amanda Walsh. However, the test audiences reacted to the character negatively, seeing her as too mean. Because of this, the character was changed, and the role was recast.
Title: Penny (The Big Bang Theory)
Content:  Tom Jicha of the South Florida Sun-Sentinel praised Cuoco's portrayal of Penny, stating: "Her character had the potential to be a bimbo, but she [Cuoco] has developed it into a fully fleshed-out woman, who isn't as book-smart as the other characters but is wiser in so many ways. She's also a great straight person, who can get off zingers of her own".
Title: Penny (The Big Bang Theory)
Content:  Penny initially moves to California in the hopes of becoming an actress. Until the seventh season, Penny works mainly as a waitress at her local The Cheesecake Factory, although in the first-season episode "The Grasshopper Experiment" she trained as a bartender. It seemed that she occasionally picked up the bartending shift in the restaurant. In 2010, when actress Kaley Cuoco broke her leg, Penny was shown working as a bartender in several season 4 episodes to hide the cast on her leg. Her work at The Cheesecake Factory was initially meant to be a temporary job for her desired profession as an 
Title: Ryōko Shintani
Content: The Big Bang Theory, Penny (Kaley Cuoco) ; Greta, Erica Penn (Maika Monroe) 
Title: Penny (The Big Bang Theory)
Content:  she is cast in a production of Rent, and in "The Terminator Decoupling" she refers to another of her roles as "Anne Frank in a theater above a bowling alley". Frustrated with her acting career, in the season five premiere, she briefly considers returning to Nebraska until landing a part in a commercial for hemorrhoid cream. In "The Monster Isolation", Penny is seen performing the role of Blanche DuBois in her acting class' production of A Streetcar Named Desire. In this episode Sheldon, who attended the show along with Leonard and Amy, is impressed with Penny's ability to memorize lines, but still 
Title: Penny (The Big Bang Theory)
Content:  by Katey Sagal, who previously played Cuoco's mother in the sitcom 8 Simple Rules. She is shown to be very embarrassed by her family's shortcomings: her son's criminal record and jailing, Wyatt's drinking, and their overall humble existence as a farming family. Although she has previously met Leonard and likes him, she is uncomfortable about meeting his academic parents, not wanting them to think of her family as "white trash". She goes to great lengths to present them in the best possible light, including buying dental implants for her son. In a 2019 episode, the names of Penny's siblings are said to be Randall and Lisa.
Title: Penny (The Big Bang Theory)
Content:  to focus solely on acting; she quits her job at The Cheesecake Factory to devote herself to become an actress. Despite usually going to her neighbors for technical assistance when she has problems with her computer, Penny does have some mechanical skills of her own. When she was a child, she rebuilt a tractor engine on the farm where she grew up and competed in a junior rodeo. During season eight, Penny gives up her acting career and gets a job as a salesperson at Bernadette's pharmaceutical company. The next season has Penny admitting that she hates her job flirting with 
Title: Penny (The Big Bang Theory)
Content:  although her expectations are somewhat high and naive at the beginning. She admits in season two that her plan was to be a waitress for six months and then become a movie star, and her backup plan was to become a TV star. She regularly goes to castings, but often ends up unsuccessful, or finding the role being auditioned to be quite different from what she expected, as was the case when she thought she was auditioning for a cat food commercial and it instead turned out to be a casting for a pornographic film. In the season one episode "The Loobenfeld 
Title: Penny (The Big Bang Theory)
Content: Leonard: "I'm not sure it's a great idea to take Penny to where wine comes from. (Looks at Penny) What? It's a joke. Oh, come on. We bust on each other. I wear dorky glasses, you might have a problem, it's all for laughs." Penny: "That would really piss me off if I didn't have a buzz going on." Penny is originally from a small town outside of Omaha, Nebraska. She is a Sagittarius, being born on December 2. She has full confidence in pseudoscientific concepts such as horoscopes, psychics and voodoo, which has led to repeated mocking from both Sheldon and Leonard as well as arguments with her about 

Question: who is the actress that plays penny on the big bang theory?
Answer: Kaley Christine Cuoco.