While there have been lots of questions about the nature of the relationship between Adam and Christina, the root for their tension seems to be teasing. Sources claim that these two are so competitive, their ribbing gets more intense when the cameras stop rolling. But Adam recently explained the feud rumors: "We bickered a little bit in the beginning, to be totally truthful, we had a little bit of a rough start, just kind of all getting to know each other. But I love her, she's the best." Maybe Adam and Christina have realized it's more profitable to bury the hatchet, since they made a single together.