Zac Efron pays tribute to 'High School Musical' friends

Zac Efron shared a sweet throwback photo with his fellow "High School Musical" cast members on Instagram.

In the pic, which was originally taken in August 2008, the "Neighbors" actor, 28, is all smiles as he poses alongside Ashley Tisdale, ex-girlfriend Vanessa Hudgens and Corbin Bleu, reported Us magazine.

"So grateful I came across this picture. With the o g crew during one of the most cherished and exciting times of my life. Love you guys forever," he wrote.

The shot was taken just two months before the third installment in the hit Disney trilogy, "High School Musical 3: Senior Year", was released.
 

Earlier this year, the cast (sans Efron) reunited for a trip down memory lane to celebrate the original film's 10th anniversary.