Britney Spears was a big donor after Wednesday night’s ‘Idol Gives Back 2008′ special on FOX, a Spears family insider tells Life & Style magazine. “She did it all on her own. She watched the show and cried for like two hours over the children in Africa with malaria,” the source told the tabloid, revealing the recovering singer donated $25,000 to the cause. “She didn’t know much about the disease, so she Googled it. She was horrified to realize kids were dying from mosquito bites. So she went online and donated after getting [her dad] Jamie’s permission. She used her Amex.”