They're friends -- onscreen and off!

Hunky Zac Efron and his High School Musical co-star Ashley Tisdale were spotted together Monday as they left their favorite diner Paty's after eating lunch in Toluca Lake, California.

PHOTOS: Zac & Ashley's Lunch Date

Efron's longtime squeeze Vanessa Hudgens apparently couldn't make it, and Ashley later Tweeted : Eating lunch with my zachary!!! Wishin nessa was here! Its been too long.

• TAGS

• Ashley Tisdale
• Lunch
• parking ticket
• Paty's Diner
• The Death and Life of Charlie St. Cloud
• Toluca Lake
• Twitter
• Zac Efron