The newly engaged star shows off a diamond sparkler at the Met's Costume Institute Gala in N.Y.C. Plus: Mariah Carey, Ashton & Demi, Clive Owen and more

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LAUGH IN

It's a regular riot as Haylie Duff hangs backstage with Legally Blonde: The Musical actress Laura Bell Bundy on Thursday. Hilary's older sis is set to host the upcoming MTV reality show Legally Blonde – The Musical: The Search For Elle Woods, in which aspiring actresses will compete to replace Bundy in the Broadway show.