Willow and Jaden Smith keep it young at the world premiere of Kit Kittredge: An American Girl at The Grove in Los Angeles on Saturday.

Will Smith, 39, and Jada Pinkett Smith, 36, brought all three of their kids to the premiere. Trey is 15, Willow is 7 1/2 and Jaden is 9 1/2.

Willow, the youngest of the Smith trio plays the Countee character in Kit Kittredge. She also had a small part in I Am Legend, playing the Marley character.

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Will Smith and Jada Pinkett-Smith’s 6-year-old daughter, Willow, films scenes for her debut film on Monday on the Toronto set of the new American Girl movie, Kit Kittredge: An American Girl Mystery.

Abigail Breslin (Little Miss Sunshine) will play the title character in the Depression-era flick. Other stars include: Julia Ormond, Chris O’Donnell, Joan Cusack, Wallace Shawn, Stanley Tucci, Jane Krakowski and Glenne Headly.

Via The Hollywood Reporter: “Kit Kittredge, the first theatrical adaptation of the popular American Girl line of dolls, tells the story of Kit Kittredge (Breslin), a clever, resourceful 10-year-old growing up in Cincinnati during the Great Depression who helps her mother (Ormond) run a boardinghouse when her father (O’Donnell) loses his job. Cusack will play a nurse who moves into the Kittredges’ boardinghouse. Thieriot will play a boy accused of committing robberies, while Shawn will play the editor in chief of the Cincinnati Reporter Register.”

Kit Kittredge: An American Girl Mystery is set for a nationwide July 2, 2008 release.

Willow’s big brother Jaden, who turns 9 next month, has also dipped his foot in acting. The little guy picked up the 2007 MTV Movie Award for Best Breakthrough Performance for the 2006 hit The Pursuit of Happyness. Jaden did not attend the Los Angeles award ceremony. Since the whole family is in Toronto, he taped an acceptance speech with his parents, which they showed after his win.

Last picture below: Will and wife Jada (not pictured) grab a bite to eat at Avenue Bar at the Four Seasons Hotel.

Will Smith met Prince’s Trust beneficiary, fashion designer Chandrika Thomas, at a charity lunch in aid of The Prince’s Trust prior to the UK premiere this evening of The Pursuit of Happyness at the Dorchester Hotel earlier today in London, England. Will, 38, brought along wife Jada Pinkett Smith, 35, and his Happyness co-star and son Jaden, 8. Jaden is too cute for words! Also pictured: Happyness co-star Thandie Newton.

What a cute family! Will Smith arrived at the premiere of the film “Pursuit of Happyness” with his wife Jada Pinkett Smith, left; his son Trey Smith, 14, top center; youngest son, Jaden Smith, 8, bottom right; and daughter Willow Smith, 6. Trey is Will’s son from his previous marriage with Sheree Smith.

The Pursuit of Happyness, which stars both Will and his son Jaden, opens in theaters nationwide next Friday, Dec. 15. Also pictured below: co-star Thandie Newton.

Will Smith was honored last night by the Museum of the Moving Image at its 22nd annual black-tie Salute on un the Grand Ballroom of the Waldorf-Astoria in New York City. The program was taped last night and will air on Friday, Jan. 12, 2007 @ 8PM on Bravo.

It was a family affair! Will, 38, was accompanied to the event by wife Jada, 35, and son Jaden, 8. Will’s finest moments were screened in front of other big names including Jamie Foxx, Eva Mendes and Thandie Newton. Will’s latest film, The Pursuit of Happyness, co-starring son Jaden will be released by Sony Pictures on Dec. 15.