NBA star Tristan Thompson’s model girlfriend Khloe Kardashian is reportedly upset with him after reports claimed that he was being sued by a woman for child support following the birth of a baby boy last week.

The Sacramento Kings player already has a girl, True, three, with Khloe and son, Prince, four, with ex-girlfriend Jordan Craig. According to a report in People magazine, Tristan got his personal trainer Maralee Nichols pregnant in March while dating Khloe, who is aware of the baby. “Khloe was upset to find out that he cheated again,” a source said. “She just can’t believe that he is going to be a dad again. It’s just a sad situation to her,” the source added.