Mariah's appearance on GMA, originally due to air live tomorrow, has been postponed. Mariah was scheduled to discuss the association between herself, Jenny Craig and the American Heart Association, and debut her new Public Service Announcement which she co-directed with Daniel Pearl.
A rep for Carey said: "Mariah is still mourning the death of her friend and collaborator Whitney Houston and thought it was too soon to appear on TV to discuss anything else."
Mariah's 1998 collaboration with Whitney Houston, "When You Believe", won an Academy Award for "Best Song" in 1999. Soon after she heard the tragic news of Whitney's passing, Mariah released a statement saying:
"Heartbroken and in tears over the shocking death of my friend, the incomparable Ms. Whitney Houston. My heartfelt condolences to Whitney's family and to all her millions of fans throughout the world. She will never be forgotten as one of the greatest voices to ever grace the earth."