Is this skin necrosis? I had Smart Lipo March 9th and these dark spots have appeared. (photos)

This is definitively not normal. You have significant necrosis, hopefully only the very superficial layer of your skin (epidermis) but it could be a full and complete 3rd. degree burn. You really need to contact your surgeon right away. You need specialized care. Best wishes.

Thank you for your questions and providing images. This is definitely something that needs to be followed up  on with your surgeon as soon as possible in order to prevent any additional complications or infection. Good luck! 

Let's start from the beginning. You have a severe amount of elasticity loss and stretch marks, which is very common after pregnancy. You chose to have Smartlipo, when a tummy tuck was the best option, hands-down. You are experiencing skin breakdown for several reasons: Your skin is exquisitely thin and therefore compromised and prone to breakdown/necrosis, your compression was likely placed too tightly, and the collagen integrity was originally not best suited for laser liposuction.
Fortunately, it seems that only the outer skin layer called the epidermis is compromised. Once it sloughs away, you most likely will see healthy skin restored. I highly recommend a cream called Dermend, which can be found over the counter at most major drug stores.  Apply it  3-4 times daily, and do not peel the dark layers. Allow them to peel spontaneously.
Good luck in your healing process!
Windell Davis Boutte', MD