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Acting
Daughter of French-born Robert Perreau-Saussine and Eleanor Child Perreau-Saussine, she was born Ghislaine Elizabeth Marie Thérèse Perreau-Saussine. Perreau achieved success as a child actress in a number of films. She got into the business quite by accident. Her older brother Gerald was trying out for the part of the title character's son in Madame Curie. Because their mother could not find a babysitter, she took Gigi along. The two-year-old, who could speak French, got the (uncredited) part of Madame Curie's daughter Ève (while Gerald would have to wait a year to make his film debut in Passage to Marseille). She also played the daughter of Claude Rains and Bette Davis's characters in the 1944 film Mr. Skeffington. In Shadow on the Wall, she starred as the sole witness to a murder. As the "top child movie actress for 1951", the then ten-year-old was given the keys to the city of Pittsburgh by its mayor, and later Pennsylvania governor, David L. Lawrence. She was the youngest person to be so honored. Perreau played the rebellious teen daughter of Fredric March in 1956's The Man in the Gray Flannel Suit. However, her film career lost momentum as she became an adult, so she turned to television. In 1959, she played a friend of Shelley Fabares on The Donna Reed Show, and had a supporting role in the sitcom The Betty Hutton Show, with her brother Gerald. In 1960, Perreau and Robert Harland performed as Sara Lou and Lin Proctor, a young couple from the east who have eloped and are heading west, in the western series Stagecoach West with Wayne Rogers and Robert Bray. Also in 1960, Perreau was cast as Julie Staunton in an episode of The Islanders, set in the South Pacific. She was cast in "Don Gringo" and "The Promise", as well as in The Rebel. In 1961, she played Mary Bettelheim in an episode of The Roaring 20s. She was cast in a recurring role on Follow the Sun series from 1961–1962 as secretary, Katherine Ann "Kathy" Richards. She guest starred on The Rifleman in 1960 and 1961. She made guest appearances on Perry Mason. In 1964, she also co-starred as Lucy, a beleaguered homesteader, on an episode of Gunsmoke. In 1970, she appeared on The Brady Bunch as a math teacher who becomes the object of puppy love by Greg Brady, one of her students. In the 2000s, she provided her voice in the animated films Fly Me to the Moon, A Turtle's Tale: Sammy's Adventures and Crash: The Animated Movie, and acted in Time Again.

Meghan Markle: An American Princess
as Self

A Turtle's Tale: Sammy's Adventures
as Whale (voice)

High Seas Hijack
as Patricia Haber

The Brady Bunch
as Miss O'Hara

Adam-12
as Iris Cooley

Hell on Wheels
as Sue Robbins

Journey to the Center of Time
as Karen White

Tarzan

Gomer Pyle, U.S.M.C.
as Rosa Lombardi
Many Happy Returns

Follow the Sun

Tammy Tell Me True
as Rita

Look in Any Window
as Eileen Lowell (as Gigi Pereau)

The Roaring 20's

Surfside 6

The Islanders
as Julie Staunton

Girls Town
as Serafina Garcia

The Rebel
as Demetria Angelica

Rawhide
as Sister Joan

The Rifleman

The Donna Reed Show
as Cathy Robinson

Wild Heritage
as Missouri Breslin

The Cool and the Crazy
as Amy

Perry Mason
as Doris Bannister

Dance with Me, Henry
as Shelley

The Man in the Gray Flannel Suit
as Susan Hopkins

There's Always Tomorrow
as Ellen Groves

Alfred Hitchcock Presents
as Gloria Barnes

Gunsmoke
as Lucy

The Wild Bunch
as Carlotta

Climax!
as Laurette Bradshaw
The Christophers

General Electric Theater
Four Star Playhouse
as Carlotta

Bonzo Goes to College
as Betsy Drew

Has Anybody Seen My Gal?
as Roberta Blaisdell

Week-End with Father
as Anne Stubbs

Reunion in Reno
as Margaret 'Maggie' Angeline Linaker

The Lady Pays Off
as Diane Braddock

For Heaven's Sake
as Item
Lux Video Theatre
as Phyllis

Never a Dull Moment
as Tina Hayward

Shadow on the Wall
as Susan Starrling

My Foolish Heart
as Ramona

Song of Surrender
as Faith Beecham

Roseanna McCoy
as Allifair McCoy

Enchantment
as Lark as a Child

Family Honeymoon
as Zoe

Studio One
as Jean
Ford Theatre

The Sainted Sisters
as Beasley Girl (uncredited)

Song of Love
as Julie

High Barbaree
as Nancy - Age 5 (uncredited)

Green Dolphin Street
as Veronica

Alias Mr. Twilight
as Susan Holden

To Each His Own
as Virgie Ingham

Yolanda and the Thief
as Gigi (as Ghislaine Perreau)

Voice of the Whistler
as Bobbie (uncredited)

God Is My Co-Pilot
as Robin Lee Scott (uncredited)

The Master Race
as Baby (as Ghislaine Perreau)