Happy birthday to you, happy birthday to you...happy birthday, dear Hayden...! The ever-so-adorable Hayden turns 18 today and that's reason enough to give her a spot on Celebrity Style. Thankfully she really deserves it as she looks super cute in her Alice + Olivia sequined LBD on her way to the David Letterman show. I also gave the birthday gal a silver clutch to complete her look. Enjoy!

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