Overview: ELLEN continues to heat up New York's Central Park when she throws a 25th birthday bash for superstar BEYONCÉ! Making her first appearance on the show, Beyoncé talks with Ellen about her boyfriend Jay-Z and how she plans to retire at 30. Plus, Beyoncé performs her hit single, "Déjà vu," and premieres her newest single, "Irreplaceable." And, Ellen has a HUGE surprise for Beyoncé to make her birthday even more special! Then, don't miss Ellen at the US Open when she takes to the court with tennis greats Andre Agassi and Andy Roddick.