updated 11/18/2011 AT 5:00 PM ET
•originally published 11/24/2011 AT 3:00 PM ET
For some, the holidays are the perfect time to take a break from their yearly diet, but Jennifer Love Hewitt won’t be indulging this holiday season.
The actress, 32, says she’s buckling down to prepare for January when she’ll start filming racy scenes in the TV series extension of her 2010 Lifetime movie, The Client List.
Playing a mom who gets into prostitution to make ends meet, Hewitt tells PEOPLE, “I will be in lingerie a lot, so I’ll be working out. I will not be eating for the holidays.”
Hewitt, who enjoys making – and devouring – mashed potatoes during this time of year, says she’ll be doing Pilates while her family enjoys the food.
“This year will be loads of fun for me,” she said, laughing sarcastically.
But once the holiday temptations pass, Hewitt has a lot to look forward to in 2012. Not only does she start filming her sexy Lifetime series, but she also guest stars in an episode of Hot in Cleveland with Joe Jonas that airs on Jan. 25. The TV Land comedy’s season premiere is on Nov. 30 at 10 p.m.