OK, get your mind outta the gutter. I don't mean "take her clothes off strip," I'm talking VEGAS STRIP!! Britney has her show "Britney: Piece of Me" on the Las Vegas strip at the Planet Hollywood Resort & Casino, and it's getting extended! Caesars Entertainment reported Sunday that they are adding 30 dates to her Las Vegas residency. Tickets to the new show go on sale Friday. Her last show sold out, so grab tix quick!!