MICHELLE TRACHTENBERG has wrapped up her role -- for now -- as bad girl Georgina Sparks on "Gossip Girl" and will be hitting the race track as a newbie professional driver in ABC Family's "The Circuit," premiering Sunday, June 8 at 8 p.m.

"I got to be the girl in the fast lane," Michelle says in a one-on-one interview with ET. "I actually got to go behind the wheel of a real race car and whip it around the track. That was fun."

While the movie isn't based on the life of DANICA PATRICK, Michelle says she did read a book about the female Indy racecar driver, who won her first race in Japan this past April. But if she has to choose between playing the race-car driving Kylie Shines in "The Circuit" or Georgina, the choice is clear.

"[Georgina] is a naughty little vixen," Michelle explains. "She has a goal in mind and she is very determined. She is an amazingly fun character to play, so I got to say the bad girl, but it is more true to life being the good girl."

Next up for the former "Buffy the Vampire Slayer" actress is the movie 'Seventeen Again,' also starring "High School Musical" hunk ZAC EFRON and MATTHEW PERRY, who both play Michelle's father!

"It is like the old classic with TOM HANKS in 'Big,' but in reverse," she tells ET. "So this time the adult becomes the kid. We ask you to believe in the willing suspension of disbelief. Matthew Perry turns into his 17-year-old self and goes to school with his kids and I get a crush on my dad not knowing he is my dad."