January Jones  jeans baby car shots doctor sunglasses
JanuaryJones092711.jpgCan you believe January Jones just gave birth two weeks ago?!

The Mad Men star stepped out with her newborn son Xander Dane Jones, though she kept him covered up -- and had someone else help carry the baby -- while leaving a doctor's office and heading over to a friend's house in Santa Monica on Tuesday.

Even in a loose beige top and dark blue jeans, the actress, 33, looks almost as skinny as she did pre-pregnancy. Looks like all those prenatal yoga classes really paid off!

We know the secret to how she's back to her slim shape, but January is keeping mum about who Xander's dad is -- no name is listed under "father" on the baby's birth certificate.