Ready to wed! Simon Cowell has a ring and is ready to propose to Lauren Silverman, sources reveal to Us Weekly. The X Factor mentor and his pregnant girlfriend are currently expecting their first child together -- a baby boy.

"Simon's mad about her," an insider tells Us. "But I think he'll wait until after she gives birth."

In September, Cowell hinted that he would one day marry the NYC socialite. "Let's put it this way, I wouldn't expect her to be a single mother," the dad-to-be told Ryan Seacrest during a radio interview.

Us exclusively broke news in July that Cowell, 54, and Silverman, 36, were gearing up for a little bundle of joy. Silverman is currently six months along, and the couple already have a name picked out. "Lauren decided on it last night," Cowell told Us at the X Factor Top 12 party in Beverly Hills, Calif. on Nov. 4.

For more details on Simon and Lauren, watch this week's Hot Stuff video, as explained by Us Weekly Senior Editor Bradley Jacobs and special guest Thea Andrews of omg! Insider.

Also in the roundup: Leonardo DiCaprio's 39th birthday bash, and much more!