Lauren Silverman stepped out in London on Monday, March 11 wearing a sheer top. Credit: FameFlynetUK/FAMEFLYNET PICTURES

She gave birth less than a month ago, but already Simon Cowell's lady love Lauren Silverman is happily showing off her post-baby body. The proud mom appeared fearless in a black, sheer top and leather leggings on Tuesday, March 11. 

Silverman, 36, and Cowell, 56, welcomed son Eric on Feb. 14, and after a post-birth vacation to Miami, the family travelled to London for the X-Factor judge's work. 

This isn't the first time Silverman's slimmed down after giving birth. She shares 7-year-old son Adam with ex-husband Andrew Silverman. Us Weekly exclusively broke the news that Lauren and the British TV personality were expecting while she was still married to Cowell's friend Andrew. 

The American Idol alum couldn't be more excited to be a first-time father, gushing about his newborn via social media and sharing intimate portraits

"I was born to be a dad!" he said during a recent Extra interview