Britney Spears surprised "Rock The Cradle" contestants Thursday night by unexpectedly showing up for the season finale to support her former manager and friend Larry Rudolph. "Rock The Cradle" pits aspiring pop stars, who have rock and roll in their DNA, against one another. The finale, being broadcast on MTV, features Jess Blaze Snider, son of Dee Snider; Crosby Loggins, son of Kenny Loggins; and...