
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.
She has also made notable appearances in feature films, including A*P*E, Girl, Interrupted, and the 2007 comedy Knocked Up. She has also starred in a number of TV movies.
In 1974, Kerns met a commercial producer, Richard Kerns, on the set of a commercial, and they married two years later. Their marriage lasted nine years and the couple had a daughter, Ashley Cooper. In 1994, she married Marc Appleton, a prominent Los Angeles architect. In August 2019, she filed for divorce from Appleton.
She previously dated comedian and actor Freddie Prinze a short time before he died of a self-inflicted gunshot wound. The two had worked together on the 1976 TV movie, The Million Dollar Rip-Off.

Girl, Interrupted
1999 · as Annette

Knocked Up
2007 · as Alison's Mom

Coma
1978 · as Diane

She's Having a Baby
1988 · as Joanna Kerns (uncredited)

The Great Los Angeles Earthquake
1990 · as Dr. Clare Winslow

The Preppie Murder
1989 · as Linda Fairstein

All Over the Guy
2001 · as Lydia

Mistress
1987 · as Stephanie

Voices That Care
1991 · as Self - Choir Member

Walt Disney World Very Merry Christmas Parade
1989 · as Self

Shameful Secrets
1993 · as Maryanne Walker-Tate

Street Justice
1987 · as Catherine Watson

Cross My Heart
1987 · as Nancy

Mortal Fear
1994 · as Dr. Jennifer Kessler

A Bunny's Tale
1985 · as Andrea

See Jane Run
1995 · as Jane Ravenson

The Growing Pains Movie
2000 · as Maggie Seaver

Not in My Family
1993 · as Veronica Ricci