"(She'll) announce that she and (husband) Marc Anthony are expecting their first child on Saturday night at her Madison Square Garden concert," the New York Post quoted the source, as saying.
And, it seems that the singer has been having a bit of a hard time keeping the news under wraps, especially after the incident at her concert in Connecticut Wednesday night.
"A fan blew the side of her top all the way up for a moment, and a definitive baby bump was there. She was very quick to push down her top. Then she talked about how this year is full of firsts for her . . . and every so often her dress would fly up and you would see her belly," another source said.