Zac Efron and Friends Premiere "17 Again"

Just arrived back home from New York City, Zac Efron made a quick change of clothes before heading out to the star-studded premeire of "17 Again" in Los Angeles on Tuesday evening (April 14).

Held at Grauman’s Chinese Theatre, the Disney heartthrob greeted fans upon arrival, then joining up with co-stars Michelle Trachtenberg, Matthew Perry and Leslie Mann for a few photos.

Joining in on the fun were big names in entertainment including the Jonas Brothers, Brittany Snow, the Michalka sisters, Samantha Drake, Seth Green and fellow HSMers, Corbin Bleu and Monique Coleman.

Also in attendance was Zac's "High School Musical" co-star girlfriend, Vanessa Hudgens, who took a solo run on the red carpet - letting her man tend to his promotional duties.

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Enjoy the pictures from the LA premiere of "17 Again" (April 14).