How cute! Penelope Disick & North West show off Khloe K's new book

Khloe Kardashian shared a photo of her nieces showing off her new book at a book signing this week. The little girls came out to lend support to their aunt. Sharing a snap of the adorable moment, Khloe, wrote: 'I can't stop smiling when I look at this photo! I love my little ladies!!'