Adam 'Ad-Rock' Horovitz and Michael 'Mike D' Diamond came out to New York City's Lower East Side for the official renaming of the corner of Ludlow and Rivington on Saturday. Hundreds of fans were there to celebrate the revealing of Beastie Boys Square, the street corner made famous on the iconic cover of their 1989 album Paul's Boutique . The event also coincided with the 50th anniversary of hip hop.