BOY, can former President Bill Clinton dish on world leaders! In a series of oral-history interviews, the sax-swing ex-Leader of the Free World at reveals that then-Russian President Boris Yeltsin was so boozed up during an official DC visit in 1995 that Secret Service agents found him standing outside the White House dressed only in his skivvies — trying to hail a taxi to buy a pizza. The next night, the sloshed leader managed to ditch his own bodyguards to wander into the basement of his guest house, where he was briefly mistaken for an intruder. The Clinton tapes are set to be published in an upcoming book.