The couple welcomed their first child at 5:45 p.m. EST in New York City. Their baby boy Eric weighed 6 pounds, 7 ounces, and the X Factor judge nearly missed the big birth moment.
The 54-year-old was shooting in London this morning when Lauren first went into labor and hopped a private jet home as soon as he heard the news. Luckily, doctors were able to delay the birth, and he made it in time to see his son delivered at Lenox Hill Hospital.
Lauren was originally married to Simon's friend Andrew Silverman when the baby news originally broke last summer, but they were estranged at the time and have since divorced. This is Lauren's second child.
"Very happy to say Eric was born at 17:45 pm. Healthy and handsome," Simon Tweeted.
Congratulations to the new parents and happy family!
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Gallery | Famous First-Time Dads!