Zac Efron and Nikki Blonsky's Working Friendship

What was the secret to the worldwide success achieved by the hit movie Hairspray? According to two of the movie's rising stars, Zac Efron and Nikki Blonsky, it was all about friendship.

The duo, who've been busy traveling from Australia to Spain and Rome for press duties, told press that they believe their on-screen chemistry in Hairspray worked out so well because they became such good friends in real life.

During an interview to promote the film in Australia earlier this week, Zac said: “There’s no one better to work with. We honestly became best friends.”

The Disney charmer continued on, "It’s cool that there’s all these great older actors, but it’s not like were gonna go, ‘Let’s go hang out with Chris Walken, let’s go to the mall. You don’t do that. Also, her family was so nice to me, they were like my other parents.”

And Zac's sentiments were seconded by Nikki, who told, “(We’re) just one big happy Hairspray family.”

Gossip Girls

Enjoy the photos of Zac and Nikki promoting Hairspray in Rome (September 14).