Jennifer Lopez is tipped to announce her pregnancy at her Madison Square Garden concert on Sunday night. The 'Jenny from the Block' singer has repeatedly denied rumors she and husband Marc Anthony are expecting their first child together, but allegedly wants to reveal the good news in her hometown. A source told New York Post newspaper: "Jennifer plans to announce that she and Marc Anthony are expecting their first child on Sunday night at their Madison Square Garden concert." Meanwhile, the 38-year-old actress-and-singer accidentally revealed what appeared to be a baby bump while performing in Connecticut on Wednesday night. One concertgoer said: "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 top would fly up and you would see her belly."