South Africa celebrates Desmond Tutu's 90th birthday

Desmond Tutu, South Africa's anti-apartheid icon, Nobel Peace Prize winner and a man dubbed the nation's "moral compass," celebrated his 90th birthday Thursday with a rare public appearance.

The jovial Tutu, who has long spoken out against injustice, attended a special thanksgiving service at St. George's Cathedral in Cape Town, where he was named South Africa's first black Anglican archbishop.

The service began with a rendition of "Happy Birthday."

Tutu, who appeared healthy and wore his purple shirt and white collar under a black suit, waved from a wheelchair.

He sat next to Leah, his wife of 66 years.

Tributes and well wishes for the anti-apartheid icon have poured in from presidents, individuals and organizations around the world.