Briana Jungwirth met the 24-year old boy band singer last May but the two broke up soon after a brief relationship.
So in essence, some could say this is a “rebound” (or “jump off”) baby.
But the lad is a proud papa, US Weekly reports.
Tomlinson and Jungwirth remain friends, the site states.
Congrats to the new parents. No word on baby’s name yet.