Zac Efron & Vanessa Hudgens -- Oscars 2009

HSM sweethearts Zac Efron and Vanessa Hudgens keep close together on the red carpet as they attend the 2009 Oscars in Los Angeles on Sunday evening (February 22).

Vanessa, 20, looks elegant in a gorgeous Marchesa gown. Zac, 21, suited up in a Dolce & Gabbana tuxedo and accessorized with a vintage Rolex watch and Bally shoes.

The on-and-off-screen couple will join host Hugh Jackman, Mamma Mia! stars (and real-life couple) Amanda Seyfreid and Dominic Cooper, Beyonce and Anne Hathaway during the ceremony tonight for a special performance.

20+ pics inside…