Even if your hips don't lie, sometimes you need a refresher on proper booty shaking technique from an expert. That's the takeaway from a series of behind-the-scenes videos -- posted by Jennifer Lopez over the weekend -- in which she gets nostalgic about her February Super Bowl halftime performance with Shakira."I do it with my knees, I shaky my knees," Lopez explains to Shakira in one of the clips in which they are shaking it together as their backup dancers take five.