The new comedy "Legally Blonde" premiered before the gliterati in New York's tony Hamptons over the weekend, and its star, Reese Witherspoon, told PEOPLE that she'll soon be showing TV host Diane Sawyer a trick or two that she picked up from the movie. Namely, it is the "bend and snap" maneuver that can't help but attract a man's attention. The movie features that and a bit more: It's the story of a Barbie-like rich California sorority girl (Witherspoon) who follows her preppie ex-boyfriend (Matthew Davis) from L.A. to Harvard Law School with a wedding ring in mind -- and, in the process, she learns about her own capabilities. Witherspoon is no stranger to introspection herself. On the subject of marrying young (in real life, Witherspoon, 25, is married to actor Ryan Phillipe, also 25; their daughter Ava will be 2 in September), the leading lady said: "When you find somebody who you really click with and you know it's right, I think that's more of the thing . . . you can't deny that and it doesn't really matter how old you are. If people sort of feel passionately about someone, then that's a good thing."