A week after unleashing a vicious volley of insults at Susan Boyle -- including calling her a "hairy a--hole" whom God hit "with a f---ing ugly stick" -- Sharon Osbourne is now apologizing for the "cheap" stunt.

"Susan Boyle is a lovely gracious woman and I took advantage of that by poking fun at her," Osbourne wrote on Facebook. "I would never want to be responsible for hurting Susan and I must apologize for getting a cheap laugh at her expense."