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"    Photo: Getty Images   No matter how sophisticated your fashion sense is, you probably can&amp;#039;t resist a good teen movie\u2014especially if it has satiric undertones \u00E0 la Heathers, Mean Girls, and Easy A. Enter G.B.F., which takes the familiar pariah-to-popular narrative and adds a satisfying twist: This time, the underage Cinderella is a shy boy who&amp;#039;s just been outed. (&amp;quot;G.B.F.&amp;quot; is, after all, an acronym for &amp;quot;Gay Best Friend.&amp;quot;) Helmed by Jawbreaker director Darren Stein, the film stars Michael J. Willett and Paul Iancono as the G.B.F.s in question. It also features &amp;#039;90s screen queens Natasha Lyonne and Rebecca Gayheart, and some emerging comic stars: Desperate Housewives alum Andrea Bowen, Harry Potter scene stealer Evanna Lynch, and Awkward&amp;#039;s deadpan genius Molly Tarlov.   The movie&amp;#039;s female lead is played by Sasha Pieterse, who is best known as Pretty Little Liars&amp;#039; mysterious heroine. In G.B.F., the South African native plays Fawcett, the underage and overdressed princess who never met a trend she didn&amp;#039;t try. ELLE.com spoke with Pieterse just before the movie&amp;#039;s premiere at the Tribeca Film Festival. ELLE: How did you get involved with G.B.F.? Sasha Pieterse: I was asked to do a reading of GBF and I loved the script. I thought it was one of the most amazing things I&amp;#039;d read, but it took a year to get a green light for production. I thought maybe it wasn&amp;#039;t happening, or maybe they went with another actress, and then Darren [Stein] called me and said, &amp;quot;Come be Fawcett.&amp;quot; ELLE: Fawcett&amp;#039;s hair is almost its own character. How did your hair get that perfect &amp;#039;70s bounce every day on the set? SP: It was a process, and it took hours. Basically, they blow-dried my hair out into curls. Then they curled it again and set it with big pins for like an hour and a half. They put in hairspray, brushed it out, and re-curled it again. ELLE: What hair secrets did you pick up while filming? SP: I&amp;#039;ve always loved Moroccanoil, and they used a ton of it for shine, and then lots of Bumble &amp;amp;amp; bumble sprays. We kind of made our own recipe and mixed it all together.  ELLE: You also get some neat designer clothes in the film, like those Chanel gloves. SP: I&amp;#039;m so glad you noticed those! During costume fittings, I grabbed them and I said, &amp;quot;I have to wear these!&amp;quot; I was so obsessed with them. At the premiere, I&amp;#039;m wearing Carolina Herrera on the red carpet. I&amp;#039;m so excited, and my stylist Jeff Kim is amazing...it&amp;#039;s the perfect dress. ELLE: Were you nervous for your scenes with Natasha Lyonne? SP:I was a little scared; I&amp;#039;m not gonna lie. But oh my gosh, we had the best scene together. She&amp;#039;s got such a presence, and when the camera started filming her, I could watch her for days. She did a monologue about her cat that was entirely improv. None of us could keep a straight face. ELLE: Pretty Little Liars is one of the biggest shows on TV, and its murder-mystery plot is often compared to Twin Peaks. Do people stop you in public and ask for hints about your killer?  SP: All the time. I got stopped in front of the bras in Victoria&amp;#039;s Secret; I get interrogated in airport bathrooms. I went to South Africa in January to see my family, and even there people would stop me and ask, &amp;quot;Sasha, who&amp;#039;s A?&amp;quot; Even my grandma. ELLE: Your grandma watches Pretty Little Liars? SP: My grandma invites people over to her house for it. She loves it.  ELLE: But you&amp;#039;re in a coffin for the opening credits...and your character is so racy! SP: I know. But she thinks it&amp;#039;s awesome.  Photo: Sasha Pieterse and Michael J Willett in GBF; photo by Darren Stein "^^<http://www.w3.org/2001/XMLSchema#string>
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