According to TMZ, the couple welcomed their daughter, Willa, last Wednesday in Los Angeles. The pair's reps later confirmed the news in a statement to People.
Sophie's pregnancy was first reported in February, but to this day, neither she nor Joe have ever spoken openly about it.
That being said, the 24-year-old has put her baby bump on full display more than once.
Joe and Sophie tied the knot in Las Vegas last May, and what a whirlwind year it's been.