Michelle Trachtenberg

Michelle Trachtenberg says she was thrilled Zac Efron played her papa in the upcoming comedy 17 Again.

"I wanna wear a shirt to the 17 Again premiere that says ’Zac Efron’s My Daddy!’" she told Usmagazine.com at the Reebok "Flash" event on Wednesday in NYC. "I don’t think his girlfriend would like it much!"

The idea of Efron, 21, being her dad is "hysterical," the 23-year-old actress told Us.

Look back at unforgettable photos of Zac Efron.

With 17 Again wrapped, Trachtenberg, who played Georgina Sparks on the first season of Gossip Girl, said she’d love to return to the show.

"If they write me back in — I mean bring back my character!" She told Us. "I love Josh Schwartz, and Georgina was so much fun to play! I’ve been doing movies so it’d be great to go back to TV. I mean, Georgina wasn’t killed off so there’s no saying she won’t be back!"

See photos of the Gossip Girl cast before they were stars.

Meanwhile, the actress is looking forward to Thanksgiving with the family.

"My mom cooks a massive feast," she raved. "I love stuffing. Pecan pie."

And forget calorie counting.

"I eat so much, and I love it," Trachtenberg told Us. "I think curves on a woman are sexy!"