They say there's nothing worse than a woman scored.  Lance Armstrong broke things off with Sheryl Crow as soon as she announced she had cancer.  I'm sorry- even if the relationship was on the rocks, the right thing to do is not kick a person when they're down.

I have no idea if Sheryl helped the feds because she was a scorned woman or if it was because she knew it was the right thing to do, but either way, Sheryl Crow knew more about ex-boyfriend Lance Armstrong's blood-doping scandal than she's let at least according to a new book that claims she spilled the beans to federal investigators.

Sheryl joined her then boyfriend on a 2004 trip to Belgium, where she allegedly watched as he got an illegal transfusion to boost his bicycling performance, a story that's shared in  Wheelmen, a new book from authors Reed Albergotti and Vanessa O'Connell. In the book, they write, "Rather than try to hide the transfusion from her, Armstrong was completely open about it. He explained that it was simply part of the sport  that all cyclists were doing the same thing."

Rumor has it Sheryl turned on Lance after being presented with a so-called "proffer agreement," which protects cooperative witnesses from criminal prosecution something she might have faced if she hadn't come forward.