This isn't good news, Billie Piper is great in Doctor Who and Rose is a great character! Mickey has already left this series, i really didn't want another character to go! I thought she signed for a third series with David Tennant but i obviously got it wrong, if it's now been confirmed that Billie is leaving...i wonder how she will leave at the end of the series?! Should be interesting to find out what happens to her character!!