An eyewitness tells ET, "They have bought other dogs here before. It was Kendall [Jenner] who brought her in last Tuesday to see the Corgi, and today Stephen came in earlier and played with the puppy while he waited for Hailey to arrive. Then he bought her the puppy."
The pals captured the moment Hailey first met her new furball on Snapchat last week. In the sweet clip, Hailey rocks the puppy back and forth while crying tears of joy.
And it seems she turned that social media excitement into a real-life addition to her family. Hailey and Stephen were spotted taking selfies with their new pet on Sunday’s trip, and Hailey shared a pic of the precious pup to Instagram, which she captioned, "My baby girl."
Hailey has yet to name her furry friend, although there seems to be one quirky option she's considering -- a source tells ET she's "thinking about naming it Chicken."