By Shayna Arnold
Updated December 12, 2007 05:40 PM
Credit: Jeff Vespa/WireImage; Scott Kirkland/INF

The Celeb: Michelle Trachtenberg, the 22-year-old former star of Buffy
The Place: The Foley+Corinna store opening in West Hollywood on Tuesday
The Discussion: Her new movie costar, a certain heartthrob from a certain Disney phenomenon called High School Musical. (They’re both in Seventeen with Matthew Perry.)

PEOPLE: How are you?
Michelle Trachtenberg: I’m actually really tired because I’ve had like three 4:30 a.m. call times in a row and I have a 6 a.m. tomorrow.

How do you deal with that?
I don’t know, but it’s nice coming to work with Zac Efron. And a lot of cheek shimmer. I have an amazing makeup artist who I’ve worked with for years and comes to set, so… And working with Zac Efron and Matt Perry – not a bad day on set.

Zac Efron. He is adorable.
And you know what? He’s so not affected. He’s like the loveliest thing and doing a great job on the movie. We are all really proud of him.

Have you met Vanessa [Hudgens, his girlfriend]?
I have not met Vanessa yet. Actually, I talked to her on the phone because I was dying to go see the Spice Girls but I was on set and it was like 7 o’clock and I was like, ‘You don’t understand, the Spice Girls!’ And she was on her way, and she called and was like, ‘I’m on my way to the Spice Girls!’ I did make it, though I missed, like, three songs. But I made it.

So you’re a big fan?
Oh yeah! I got “Wannabe,” and “Spice Up Your Life.” Fabulous.