(EXCLUSIVE COVERAGE) Former tennis player Steffi Grafarrives at the Keep Memory Alive foundation's "Power of Love Gala" celebrating Muhammad Ali's 70th birthday at the MGM Grand Garden Arena February 18, 2012 in Las Vegas, Nevada. The event benefits the Cleveland Clinic Lou Ruvo Center for Brain Health and the Muhammad Ali Center.
( - Source: Ethan Miller/Getty Images North America) see more angles »
( - Source: Ethan Miller/Getty Images North America) see more angles »
