January Jones gave birth just four weeks ago today, and she’s already back on the set of Mad Men for her first day of work. I’m tempted to say Jones is (very understandably) still working on shedding the baby weight – but that could be the result of the period outfit the show’s costume department has stuck her in. A floral mumu never made anyone look slimmer, though it was certainly classic maternity wear back in the sixties.

Little Xander Dane Jones was sleeping soundly in January’s trailer during filming. The actress is still refusing to name the baby daddy – she left the “Father” spot blank on his birth certificate. Everyone’s obsessing over who the dad might be, going through all of Jones’ exes and recent supposed flings. But considering she supposedly was very vocal about wanting a child, has anyone considered maybe she used a sperm bank? That’d be another reason she wouldn’t say who the dad is: she might not know more than his donor number. Just a thought.