The “X Factor” judge and his girlfriend Lauren Silverman welcomed baby boy Simon Eric Cowell.
The proud dad, 54, took to Twitter to announce the happy news: “Very happy to say Eric was born … Healthy and handsome.”
“Lauren in great shape. Thanks for all of your kind messages. Named after my dad,” he added.
News about pregnancy were made public last July.
Last August, Cowell opened up for the first time about becoming a father.
“I’m proud to be a dad,” he told BBC at that time. “It’s something I hadn’t thought of before, but now I know I feel good about it.”
As for his baby mama, the music mogul has spoken in another interview, this time with Ellen DeGeneres, on September 2013, calling her “a great girl.”
This is the second child for Lauren Silverman, who already has a son with ex-husband Andrew Silverman.