Dustin released a statement to ET announcing the news, saying, "Paulina and I are happy to announce the arrival of our baby boy, who was born in Los Angeles on Monday morning. Both Paulina and the baby are healthy, resting comfortably and in great spirits! We sincerely appreciate the outpouring of love and support we have received and plan to release further details in the coming days!"
The 25-year-old model echoed this sentiment in her first post-baby Instagram. "Happiest day of our entire lives was welcoming our sweet baby boy into the world," she wrote.
Paulina first announced her pregnancy in September.
"@djohnsonpga & I are so excited to finally share with you all our amazing news..we're having a baby!" she posted on Instagram last fall.