Lady Gaga performed in South Korea to about 45,000 fans, despite a backlash from local Christians. It's the latest in Gaga's attempt to be this generation's incarnation of Madonna (despite Madonna's continuing attempts to be this generation's incarnation of Madonna).
Reuters reports that protesters called for her concert to be canceled, calling it "pornographic" and saying that Gaga promotes homosexuality.
There may be some debate about whether she promotes it in her music, but certainly "is a fan of," judging by most of what she does, would be fair. Her song "Born This Way" in particular has been adopted as a gay anthem, and even made its way to a country version (a version which was recently covered by Skylar Layne on "American Idol").
She also started the Born This Way Foundation, which seeks to "foster a more accepting society, where differences are embraced and individuality is celebrated." The foundation is also sponsored by Harvard's Berkman Center for Internet & Society, the MacArthur Foundation and the California Endowment.