Nicki Minaj is thrilled to be expecting her first child with husband Kenneth Petty.The Grammy nominee, 37, “is over the moon,” a source exclusively told Us Weekly on Monday, July 20. “She has wanted to become a mother for a long, long time, and now her dream is finally coming true! She feels so blessed to be pregnant and can’t wait to meet her mini-me.”The rapper made her baby bump debut via Instagram on Monday with maternity shoot photos captioned, “#Preggers. Love.