Published Friday, 14 February 2014
Simon Cowell, with Nigel Harmen who plays him in a new X Factor-inspired musical (© ITV)
The 54-year-old, who will be returning to the X Factor head judge's seat for the next series, is believed to have had his private jet on standby and is now flying back to the US.
According to reports, Lauren has not yet gone into labour, but has been admitted to hospital.
Their relationship first came to light after Simon was named as a "co-respondent" in divorce papers filed by Lauren's now ex-husband Andrew Silverman last year.
Simon's fellow BGT judge Amanda Holden was among the first to wish the soon-to-be parents well.
Earlier, former Westlife star Kian Egan spoke to Simon for a This Morning interview about impending fatherhood, his X Factor return and the new Harry Hill musical based on the show.
"X Factor is now my second baby, because I've got a real baby!" Simon said.
© UTV News