Why is Britney Spears hiding her lip?

Pop Princess Britney Spears was a little self-conscious this morning about her lip as she headed to the Commons in Calabasas, California on October 19, 2010 for some shopping and coffee with her patient bodyguard. Britney was denied entrance to the stores of her choice and Starbucks because of a power outage and headed back to the car but why was she hiding her lip from the cameras and acting strange? Could Brit have a cold sore, falling back into her old odd ways or just not in the mood? In other recent news it has been reported that the pop singer could be granted the right to invest her funds with the help of her advisers into some heavy companies.