Credit: Albert Michael/

Kourtney Kardashian knows how to rock the new-Mommy look!

Kardashian, 30, stepped out in Los Angeles on Wednesday -- and she wasn't alone.

In knee-high leather boots, leggings, and a t-shirt, she ran errands around town as she clutched tiny Mason. Her baby boy with boyfriend Scott Disick was born on Dec. 14.

On Twitter Wednesday, the 5-foot-1 star clarified how much weight she gained during pregnancy -- more, not less! "I gained 40 pounds while pregs, not 26!" she wrote.

See more amazing post-baby bodies!

During the pregnancy, her mother Kris Jenner told that she and Kourtney both planned to lose weight via QuickTrim, the dietary supplement for which Kim and Khloe are spokespeople.

I'm going to do it with Kourtney," Jenner told "Kourtney is going to do it for after the baby. We are very excited."