Mariah Carey was condemned in 2008 for performing for Libyan dictator Muammar Qaddafi, which she later regretted.
"I was naive and unaware of who I was booked to perform for. I feel horrible and embarrassed to have participated in this mess," Carey told US Magazine. "Ultimately we as artists are to be held accountable. Going forward, this is a lesson for all artists to learn from. We need to be more aware and take more responsibility regardless of who books our shows."
According to The Telegraph, the singer was paid $1 million to perform for Angolan dictator Jose Eduardo Dos Santos last weekend.
Carey also posed for a picture (right) with Dos Santos and his wife.
Human rights groups say Dos Santos, whose official title is "President of Angola," has executed political opponents and journalists, fixed elections and exploited the country for his personal wealth.
ABC News notes that Carey reportedly told the audience: "I am happy to be here in this room, and I am honored to share this show with the president of Angola."
However, her concert was condemned by the Human Rights Foundation.
“Mariah Carey can’t seem to get enough dictator cash, reportedly more than $1 million this time," the Human Rights Foundation's Thor Halvorssen said in a press release.
"It is the sad spectacle of an international artist purchased by a ruthless police state to entertain and whitewash the father-daughter kleptocracy that has amassed billions in ill-gotten wealth while the majority of Angola lives on less than $2 a day,” added Halvorssen.
In response, Angola's government-controlled news agency claimed the concert raised $65,000 for the Angolan Red Cross, which is run by Dos Santos daughter, Isabel, who is the country's only billionaire.
Rafael Marques de Morais, editor of the Angolan website MakaAngola.org, told the Human Rights Foundation: “The presidency was happy to cover the capital in posters of her performance, but on November 23 the presidential guards murdered an activist in custody for posting fliers. Those fliers were a peaceful protest of the murder of other activists disappeared by state police. How does Mariah Carey, the artist and humanist, who so often speaks about human rights, feel about that?”
“The Angolan Red Cross gala raised $65,000, which wouldn’t cover the cost of fuel for Isabel dos Santos’ private plane ride to go shopping in Paris. Mariah Carey’s transportation alone cost several times that number. It’s absolutely shameless,” added de Morais.