Following a couple of health scares this year, Robin Gibb is in the fight of his life. The Bee Gees star has reportedly been diagnosed with liver cancer, according to the Daily Mail—a condition he became aware of several months ago.  The 61-year-old "Stayin' Alive" singer, who has become noticeably thinner in recent months, has had to cancel several appearances recently due to issues with severe abdominal pain.  Most recently, Gibb was rushed to the hospital Tuesday, following an emergency call from his home. He was released later that day. News of Gibb's diagnosis comes on the heels of another hospitalization in October, due to severe abdominal pain.