John Legend prepares his daughter Luna, two, for her new brother

He's set to welcome his first son in just a matter of weeks with his wife Chrissy Teigen.

And John Legend ensured his daughter Luna is well-prepared for her big sister duties as he shared an adorable snap of the pair reading The Brother Book on Instagram on Wednesday.

The Ordinary People singer, 39, beamed with delight as he posed with his cherubic toddler, two, who sported a wide grin as she appeared excited to read the family classic.

Cute: John Legend ensured his daughter Luna, two, is well-prepared for her big sister duties as he shared an adorable snap of the pair reading The Brother Book on Instagram on Wednesday

Cute: John Legend ensured his daughter Luna, two, is well-prepared for her big sister duties as he shared an adorable snap of the pair reading The Brother Book on Instagram on Wednesday

In the snap, John kept it casual in a simple black T-shirt and captioned the snap: 'Prepping for a new arrival!'   

Created by bestselling author Todd Parr, the storybook focuses on celebrating siblings, and follows his publications The Sister Book, The Mommy Book, The Daddy Book, The Grandma Book, and The Grandpa Book. 

The award-winning singer is no stranger to sharing his tender

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