Whitney Houston rocked Central Park on Tuesday afternoon taping a concert segment for Good Morning America that will air on Wednesday morning. Houston's voice cracked several times, which she blamed on her taping The Oprah Winfrey Show on Monday. "I'm sorry! When I'm talking, I should be singing," she told the capacity crowd. GMA's Robin Roberts and Diane Sawyer joined Houston on stage for her anthem "I'm Every Woman" at the show's end. (Photo: WENN)