Question: Memoirs of an Imperfect Angel is the twelfth studio album by an American singer, songwriter, record producer, and actress who rose to fame with the release of her debut album named what?
Sentence (from "Betcha Gon' Know (The Prologue)"): In October 2010, Carey revealed that she had in fact been pregnant in late 2008, and that was the reason why tour plans were cancelled.
Relevant evidence: No