What we're watching tonight:
- NBC (1080i) has The Sing-Off at 8 p.m.
- CBS (1080i) How I Met Your Mother at 8 p.m., Rules of Engagement at 8:30 p.m., Two and a Half Men at 9 p.m., Mike & Molly at 9:30 p.m. and Hawaii Five-0 at 10 p.m.
- ABC (720p) has Skating With The Stars at 8 p.m. and Mariah Carey: Merry Christmas to You at 9 p.m.
- Discovery (1080i) has American Chopper: Junior vs. Senior at 9 p.m. and the season premiere of Howe & Howe Tech at 10 p.m.
- USA (1080i) has WWE: Raw at 8 p.m.
- TNT (1080i) has The Closer at 9 p.m. and Men of a Certain Age at 10 p.m.
- History (720p) has American Pickers at 9 p.m.
- A&E (720p) has the season premiere of Intervention at 9 p.m. and Hoarders at 10 p.m.
- ESPN (720p) has Ravens/Texans Monday Night Football at 8:30 p.m.
- TLC (1080i) has Next Great Baker at 9 p.m. and Fabulous Cakes at 10 p.m.