Some expectant moms go to great lengths to hide their baby bumps -- but not Mariah Carey! The then-pregnant star (who welcomed twinsMonroe and Moroccan in April) twittered a photo of her decorated belly on her 42nd birthday. "My attempt @ festiveness on 327!" the "Butterfly" singer wrote on March 27. "For ATLITL thank u + I♥U! Comin soon #dembabies! LYMA+thanx 4 making me happy."