explosive new book coming out — and she’s dropping some truth bombs on Oprah Winfrey.The “Hero” singer-songwriter revealed Wednesday night via Instagram that she’s in “The Oprah Conversation” hot seat Thursday on Apple TV+.“I couldn’t have asked for a better way to introduce my memoir than having a conversation with my friend, therapist and icon Ms. @oprah, on her series @theoprahconversation,” Carey, 50, hyped in her Insta post.