Zac & Vanessa's Spain Premiere -- HSM3!

Zac Efron keeps close to on-and-off-screen girlfriend Vanessa Hudgens at the the screening of the film High School Musical 3: Senior Year on Thursday in Madrid, Spain.

Vanessa, 19, stayed classic in black and wore a sparkly Jenny Packham with matching strappy shoes. Zac, 20, opted for a navy suit with a skinny tie and tie clip.

High School Musical 3 opens in theaters everywhere October 24.

25+ pictures inside of Zac and Vanessa premiering HSM3 in Madrid, Spain…