In his latest salvo against the president, Special Prosecutor Kenneth Starr publicly taunted Bill Clinton Tuesday with the humiliating 'sittin' in a tree' song. 'Bill and Monica / Sittin' in a tree / K-I-S-S-I-N-G,' Starr sang to reporters at a Washington Hilton press conference. 'First comes love / Then comes marriage / Then comes Bill with the baby carriage.' Upon completion of the song's first verse, Starr abruptly ended the press conference. Spokespersons for Starr said he has not ruled out the possibility of singing the 'wetting his pants / hula-hula dance' versewidely considered the most devastating of the entire songat a later date. 