Credit: Jon Kopaloff/FilmMagic

Christina Ricci wants more junk in her trunk.

"I’m desperately trying to convince my boyfriend to get me the Brazilian Booty Lift!” Ricci, 30, told at Saturday's Chrysalis 9th Annual Butterfly Ball.

After watching the infomercial for the DVD workout series, the Bel Ami star was convinced that the combination of plies, squats, lunges, plyometrics, touchdowns, kickbacks and dance would improve her derriere.

"I was like, 'Don’t you want me to have that ass?'" she said. "They are just Brazilian butts!”

To keep the rest of her body looking lean, the actress -- who's prepping for her Broadway debut this September -- credits the treadmill for helping to maintain her svelte shape.

"I do a lot of walking on my treadmill because I injured myself once jogging," Ricci tells Us. "Now I just walk on an incline....I really try to do something physically active every day."