Khloé Kardashian's boyfriend Tristan Thompson is now a daddy!

The NBA star welcomed his first baby with his ex-girlfriend Jordan Craig, according to a new report from X17 Online. The model reportedly gave birth on Monday, Dec. 12, to a baby boy named Prince via C-section.

The 32-year-old KUWTK star has been a supportive girlfriend throughout Tristan's baby mama's pregnancy — she even paid for him to fly out from his home in Cleveland to Los Angeles so that he could be in the delivery room at Cedars-Sinai Medical Center with Jordan during their child's birth.

MORE: Khloé Kardashian Gushes About New Boyfriend Tristan Thompson — "He's a Little Cutie!"

Jordan announced her pregnancy with the 25-year-old Cleveland Cavaliers player back in October, which was just one month before Khloé and Tristan went public with their relationship. Life & Style exclusively reported that Jordan wasn't happy that her ex-boyfriend was so public with his new relationship while she was pregnant with his baby.

"Jordy wants Khloé to back off," a source said at the time. "Tristan would be with Jordy at the doctor's office, and he'd be off in the corner FaceTiming Khloé."