Dad-to-be Mario Lopez is “dying for a son,” a source tells Page Six. The “Extra” host was spotted being “extremely attentive” to pregnant girlfriend Courtney Mazza at a Svedka Vodka party at Wonderland the other night. Despite saying they didn’t know the baby’s gender yet because “I think that is one of life’s great surprises,” Mazza was overheard telling friends that Mario is “dying for a boy — but will be happy either way.” Later, Lopez and new mom Kourtney Kardashian were overheard talking about organizing a play date once his baby is born.