simon-cowell-lauren-silverman.jpgSpread Pictures

Simon Cowell is expecting a baby with New York socialite Lauren Silverman, who is married to Cowell's close friend Andrew Silverman, reports Us Weekly. "She's around 10 weeks along," an insider tells the mag, adding that she plans to "leave her estranged husband to be with the father of her child."

X17online first broke the news of their relationship back in January of 2012 when our photographers snapped the two on Simon's yacht in St. Barth, looking like far more than just friends. A bikini-clad Lauren was by Simon's side the entire trip, so we knew something was up!

"Lauren and Andrew have been unhappy in their marriage for some time, and their divorce has been in the works for a while," the source added. "As their marriage deteriorated, she and Simon became close."

Click the gallery below to see how it all began!