Nicole Richie planning to write a cookbook?!

In a move that would have sounded insane just a year or so ago, Nicole Richie is reportedly considering writing a cookbook after becoming a fan of life in the kitchen.

The previously super-skinny socialite is said to have become a culinary expert over the last year - feeding herself and Joel Madden during her pregnancy, then whipping up baby meals since daughter Harlow was born in January.

A source told OK magazine: “She keeps a box full of recipes handwritten on index cards - she has mac and cheese down to a fine science!

The source added that Nicole has also used her newfound talents to help lose her pregnancy pounds: “She keeps things low-fat to help her and Joel watch their weight.”