Ali Larter blonde baby tired medical center

Rocking her newly-cropped "mom 'do," Ali Larter looked a bit tired as she carried son Theodore to his doctor's appointment at a medical center in LA, on Friday.

The hot momma donned a white button-down shirt, dark jeans and a chunky turquoise necklace for the outing, which little Theo seemed to adore!

Larter has been busy planning Theo's big first birthday party for Dec. 20, and it's going to take place in not one, but two separate states!

“We’re doing a big one on the actual day in Chicago where my husband [Hayes MacArthur]‘s family is, and we’ll do a mini one with my family,” the actress revealed to People.

And what about the theme?

“He’s so musically inclined — he loves his music class — I think we’ll do something with lots of drums, tambourines and guitar. Something jammin’!”

Happy birthday, Theo!