Writers Josh Goldsmith and Cathy Yuspa ("What Women Want") strike notes of truth as they add tantalizing new twists to the same amusing fantasy that Tom Hanks handled in Penny Marshall's "Big." And director Gary Winick turns this sweet, romantic comedy-with-a-message - Be True to Yourself - into a great, rollicking romp about second chances and turning back time.

Jennifer Garner of TV's "Alias" is particularly delicious in her exuberant innocence. She's a vivacious, natural comedienne, one of the brightest, most talented new actresses to emerge in recent years. As her editor-in-chief, Andy Serkis skillfully emerges from CGI anonymity as the Golem in "Lord of the Rings." As her confidante, Judy Greer hits just the right duplicitous note. And as Jenna's now-grown "first love," Matt Ruffalo is charming and credible, particularly when she gets him to join her moonwalking to Michael Jackson's "Thriller." On the Granger Movie Gauge of 1 to 10, "13 Going On 30" is an engaging 8 - a clever and beguiling chick flick that could turn out to be a terrific date movie. Bring on the "Wishing Dust," along with the popcorn.