Kourtney's being a dutiful mom, while Scott's out playing -- what's new about this picture?! Absolutely nothing!

Kourtney Kardashian took her 1.5-year-old, Reign, to the doctor in Calabasas on Wednesday. Meanwhile, her baby daddy was nowhere in sight -- instead the party boy was joy riding around in a new $350K Rolls Royce and eventually heading over to hang with Rob Kardashian and Blac Chyna at their home.

Is it just us or do you think that Scott should be with his wee one, instead of chilling with his pals?!

Either way, Kourt did look like she had things under control as she headed into the doc's office wearing a sheer white tank, black sports bra, leggings and tennis shoes.

We sure hope Reign is okay!