Take note, Supernatural and Smallville fans:

The 2011 premieres of these hit CW shows have been pushed back a week. The reason? The network wants to re-air this week's return installments of The Vampire Diaries and Nikita in order to give them maximum exposure.

Both dramas went up against American Idol on Thursday and both were pre-empted in a few major markets (e.g. Chicago, Baltimore). Set your viewing plans accordingly.