An insider tells Us that Cowell pulled out of filming Britain's Got Talent in the U.K. on Friday, and boarded a private jet heading to New York for the arrival of his baby boy.
Us Weekly exclusively broke news back in July that Cowell was expecting his first child with Silverman. The New York City socialite is already mom to 7-year-old son Adam with ex-husband Andrew Silverman, whom she divorced in August 2013.
During an interview with Ryan Seacrest back in September, Cowell said he didn't want to witness the birth of his son. "I know this sounds awful, but it's like you don't want to go in to the restaurant while they're making your dinner," the former American Idol judge said. "I think there are certain things you shouldn't see and that is one of them. I'll be very close by, but no [I won't watch.]"
Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!