Singer Jordin Sparks arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actor Verne Troyer arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actress Reba McEntire arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actress Rita Wilson arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actress Rita Wilson (L) and her husband actor Tom Hanks arrive at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Singer Miley Cyrus arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actor Billy Crystal arrives at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Actor John Corbett (C) performs with his band at the Muhammad Ali's Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Muhammad Ali sits on stage as he is greeted by actor Kris Kristofferson (L) during Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Muhammad Ali (C) sits on stage next to his sister-in-law Marilyn Williams (L) and as singer Miley Cyrus (R) speaks to the crowd during Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)

Muhammad Ali (C) sits on stage between his sister-in-law Marilyn Williams (L) and wife Lonnie Ali during Celebrity Fight Night XVIII at the JW Marriott Desert Ridge Resort & Spa in Phoenix, Arizona. (REUTERS)