Joanna Crussie DeVarona Kerns is an American actress and director best known for her role as Maggie Seaver on the family situation comedy Growing Pains from 1985 to 1992.

After Growing Pains ended, she turned to directing. She directed one episode of Growing Pains while starring on the show and got hooked. She has also directed episodes of television shows including Dawson's Creek, Titans, Scrubs, Private Practice, Psych, Felicity, Grey's Anatomy, Privileged, ER, Ghost Whisperer, Army Wives, Pretty Little Liars, Switched at Birth, The Goldbergs, This Is Us, and Fuller House.