Stevie Wonder’s eleven-year marriage to fashion designer Kai Millard Morris is winding down. The music legend has filed a petition for divorce, citing “irreconcilable differences.” According to divorce documents obtained by TMZ, the couple has been separated since October 2009. Wonder is requesting joint custody for the couple’s two boys, ages ten and seven. He also agrees to pay both spousal and child support. Wonder was previously married to late singer Syreeta Wright between 1970 and 1972. looks like his ribbon is gone…