Britney Spears has topped an annual April Fool's Day weekend poll to find the Most Foolish Americans. The shaven-headed pop star beat her one-time party pal Paris Hilton, Michael Jackson, President GEORGE W. Bush, Mel Gibson and O.J. SIMPSON in the Opinion Research Group's foolhardy list. Poll compiler JEFF BARGE claims Spears was an easy choice for the top spot: "She went commando, mutilated her own head, bobbled her baby in public; they've all been done before by various contenders but never before in combination."