Celebrity oversharing on Twitter has gone from the drama-ridden (Lindsay Lohan) to the inane (Solange Knowles, Ashlee Simpson-Wentz, and Nicole Richie making playdates for their kids). The New York Daily News zeroes in on the most popular celeb Twitterers, starting with Britney Spears, who has Ashton Kutcher on her heels. To read some recent Tweets, see the photo captions at left.