The model and TV personality took to her Instagram page on Monday to wish her husband happy birthday , she shared some adorable photos of Justin Bieber and herself saying "Happy birthday best friend. thank you for putting a smile on my face every single day... I love you She captioned the photos . After sending him a loving message she revealed one of the cheeky nicknames she calls the pop star in an Instagram comment on his hairstylist Florido's birthday message. Offering a possibly-joking admission, she revealed she likes to call Bieber 'Daddy.'