North West posted a Mother’s Day pic for mom Kim Kardashian on Sunday. Instagram/northwest Bling, bling. Kim Kardashian’s daughter North West, 12, showed off their matching diamond grills on Instagram in honor of Mother’s Day. “happy mother’s day 🖤,” wrote West on the image. Immediately following the image was a short video of the pair pointing to their iced-out smiles. In it, the pair wears matching diamond grills. Instagram/northwest The diamond jewels were first debuted around the holidays — a Christmas gift from Kardashian to West. Instagram/@northwest Kardashian posted a decidedly different Mother’s Day share on Instagram, writing “My babies!!! Thank you for choosing me to be your mom” along with a compilation video of sweet private moments with her growing family. The pre-teen has made expensive sets of grills part of her go-to uniform, adding to her growing collection of dermal piercings .…