What's Your Must-Have Hair Product?

Despite the love/hate relationship we have with our hair, there's always that one product that never fails to do the trick. In the May issue of StyleWatch, we got the scoop from several celebs on what styling product they rely on to keep their coifs picture perfect. Before getting a blow out, Reese Witherspoon protects her hair with Vavoom Gold Heat Blow-In Control, $14, which seals the hair and protects it from intense heat. Jessica Biel maintains her healthy hair -- and fights frizz and flyaways -- with Kerastase Serum Oléo-Relax, $34. Newly shorn Michelle Williams keeps her pixie cut in place with Murray's Original Pomade, $3. Jennifer Lopez nourishes her long locks with Leonor Greyl Palm Oil, $39, which is especially great if you spend a lot of time in the sun. So now that you know these celebs secret hair weapons, we want to know what always works for you. Tell us: What styling product can't you live without? Why?

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