Katherine Kelly Lang (born July 25, 1961) is an American actress, best known as Brooke Logan on the American daytime soap opera The Bold and the Beautiful.
Lang's first credit was a movie called Skatetown, U.S.A. (1979), with Scott Baio, Mark Hamill, and Patrick Swayze. That was followed by guest roles in various television series such as the short-lived The Powers of Matthew Star and Masquerade and the longer-running Riptide, Happy Days, The Fall Guy, and HBO's 1st & Ten.
In 1987, she was offered the part of middle-class Brooke Logan on the soap opera The Bold and the Beautiful (B&B), and has been an integral part of the program ever since. Her love affair with Ridge Forrester (played by Ronn Moss) has been a key story arc for over 20 years, and a love triangle among Brooke, Ridge, and Taylor (Hunter Tylo) stretched across an entire decade. The show's 5,000th episode included only four characters: Brooke, Ridge, Stephanie and Eric.