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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International superstar Will Smith gets silly while getting his hand and footprints immortalized Monday at the Grauman’s Chinese Theatre in Hollywood.

Pal Tom Cruise was there to show support for Smith, acting just as nutty.

He told Entertainment Tonight, “I feel honored to know him and his family. When I get around him I feel inspired. We push each other and we need that. We share that same level of reality and commitment that we have to our craft and to our family. Its fun. Wherever Will Smith is, that’s where the party is!”

Added Tom about Will’s music, “He is an extraordinary artist. When I was doing Born on the 4th of July, his music got me through that picture.”

Tom also addressed if Will could beat his wife Katie Holmes in a marathon. Tom laughed, “Kate is fast! I said to Will, ’she ran a marathon, we’ve got to see if we can’t run a marathon. She did it!’ The day after she ran the marathon I was at the hotel and got in the elevator drenched in sweat and I smelled… I said, ‘Listen, when your wife runs a marathon, you’ve got to get on the treadmill the next day!’”

Also in attendance were Will’s kids, who are also actors–son Jaden, 9, daughter Willow, 7. Noticeably missing was his wife, Jada Pinkett-Smith. Tie by Louis Vuitton.

45+ pictures inside of Will Smith getting immortalized… More Here! »

EXCLUSIVE!

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.