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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AHEAD OF THE CLASS

Showing their senior class solidarity, High School Musical 3 stars Ashley Tisdale, Zac Efron, Vanessa Hudgens, Monique Coleman and Corbin Bleu return to the spotlight Friday at a press conference in Salt Lake City, Utah, to promote the third installment of their musical mega-hit.