Do kiss and tell, Sheryl Crow.

In an upcoming book, we'll find out what she told federal investigators who were looking into former boyfriend Lance Armstrong's Tour de France-winning teams and possible doping years ago.

According to the New York Daily News, the Grammy Award-winning Crow was with Armstrong when he received a blood transfusion in 2004 and later told federal investigators about what she saw.

This comes in the book “Wheelmen: Lance Armstrong, the Tour de France, and the Greatest Sports Conspiracy Ever,” that's due out Tuesday.

Wall Street Journal reporters Reed Albergotti and Vanessa O’Connell wrote the book. The write of Armstrong's doping scheme, and report that Crow and Armstrong took his private jet to Belgium, where he received the transfusion.

Read more here.