Britney Spears covered Alanis’ Morrisette’s 90s break-up anthem “You Oughta Know” in Greensboro, NC over the weekend. An unbelievably enthusiastic fan captured it in all it’s Dave Coulier-clawing glory. Sources who attended Britney’s recent outing at MSG came home convinced she was lip-syncing. Tough to call on this one, but she sounds pretty okay. You know, for Britney