If you like the "fake boyfriend" genre of romance, you've probably seen Holiday in Handcuffs, starring Melissa Joan Hart and Mario Lopez. It's definitely on the silly side and relies on slapstick and unrealistic situations; if you don't mind that kind of humor, you'll laugh yourself all the way to Christmas. Just don't take a leaf from Melissa's book. Kidnapping is a felony.
As the year comes to a close, Melissa feels like a total failure because she doesn't have a husband and kids. She doesn't even have a good job and has never achieved her artistic dream. In a moment of desperation (and insanity), she pulls a gun on a handsome man she met at work while waitressing and forces him to come home with her for Christmas. She wants him to play the devoted boyfriend, but he tries to escape and tell the truth to anyone who will listen. Fortunately, Melissa's family is very stupid and doesn't listen to him - otherwise they'd never have time to fall in love!
This one isn't my favorite because it is quite silly, but it is fun to watch every few years. It's always a nice bit of escapism to see a woman lasso herself a handsome, single man who falls madly in love with her just in time for Christmas.