February 14 is here, and you know what that means: it's time to celebrate Valentine's Day. How are your favorite rockers celebrating this special day? By taking to Twitter and letting their fans know just how they feel. In a few cases, those feelings seem to boil down to a simple "please buy my stuff" message, but some artists have gone to the trouble of sending special thoughts just for you -- heart-shaped characters and all! Here are 10 classic rock Valentine's Day tweets: