Heidi Klum is furious over Seal’s recent reported behavior. Sources tell us the supermodel is unhappy following reports he partied with two girls in a Sydney hotel room while their kids were sleeping in the next room. Radar Online reported that the singer invited the women up his penthouse suite at the Darling hotel, but the fun ended when security got involved. It was reported that the two women had ditched their boyfriends in the lobby while they went upstairs to Seal’s suite and the men became agitated when they didn’t return. A friend of Klum tells us, “Seal can do what he likes, except when the children are there. Heidi and Seal have not yet finalized their custody agreement, and this may be brought up.” While the hotel incident is believed to have taken place a few weeks ago, Klum spent July Fourth with the kids on Shelter Island. Seal was photographed frolicking on a yacht with a bikini-clad brunette. A rep for Seal wasn’t happy when we asked about his alleged behavior: “That is absolutely untrue and a complete lie. I would strongly urge Page Six to not run unsubstantiated lies.”