She had sat on the Good Morning America couch countless times, but when correspondent Amy Robach took her place there on Nov. 11, it was unlike any other morning. Seated beside coanchor Robin Roberts and clutching the hand of senior medical contributor Dr. Jennifer Ashton, Robach revealed that the mammogram she'd undergone live on air on Oct. 1 led to a diagnosis she says is "still hard for me to say out loud: I have breast cancer." Although the mom of two daughters and stepmom of three sons - she's married to Melrose Place actor Andrew Shue - doesn't yet know if the cancer has spread, she opted to undergo a bilateral mastectomy on Nov. 14. While her colleagues fought back tears, the journalist, 40, remained composed. "There are no words to say how courageous Amy is," says Ashton. Now, Robach concedes, comes the real fight: "I am mentally and physically as prepared as anyone can be."