From a 2009 article:
British pop icon Annie Lennox shocked the crowd as she performed “Chain of Fools” with soul legend Aretha Franklin last night. Some fans who tuned into the Rock and Roll Hall of Fame concert on HBO on Sunday became worried about Annie’s health after taking a glimpse at the singer’s t-shirt, which read “HIV POSITIVE” in blarring letters.
Don’t worry — Annie hasn’t been diagnosed with the virus that causes AIDS. The t-shirt is a part of the musician’s on-going campaign to help raise awareness about the impact HIV/AIDS.