Beyonce went all out for her hubby's 40th surprise bday party held at the Casa de Campo resort in the Dominican Republic. Whew! Must have been nice... This was a star studded event, with only 50 of Jay-Z's closest friends which included Diddy, Kate Hudson, A-Rod, Kanye West and Alicia Keys. DJ Cassidy was on the 1's and 2's, and the party, which had a 1940s theme, included a fireworks show and two dance floors. Jay-Z and Keys sang an impromptu version of their hit song, "Empire State of Mind," and West gave a toast to his friend, the birthday boy. SOURCE