Fans love Britney Spears for her addictive beats and sexy videos more than her breathy voice and light lyrics. Her new single released today, "Hold It Against Me," doesn't break the infectious pop-music mold. But while the words to her songs take a backseat to the spectacle, we've still gotten them stuck in our heads as we hear them driving in the car, on Glee, or while we're getting ready for a Saturday night out. As inescapable Britney lyrics continue to be etched in our brains, what lessons have they taught us about love and relationships? Some good and some bad. I took a look at Brit's hits and distilled the not-so-deep yet still entertaining advice contained within. Here's a look at the best and the worst advice courtesy of Miss Britney Jean Spears (or her songwriters at least).