Britney Spears has canceled two shows in Las Vegas this weekend after injuring her ankle in an embarrassing onstage fall, her publicist said Thursday. "Britney injured her ankle during her performance Wednesday evening and her doctor has advised her not to perform Friday and Saturday evening so that she may heal," said a statement. The star was singing her 1999 tune (You Drive … [Read more...] about Britney Spears cancels shows after stage fall