Hailey Baldwin -- Falls in Love, Spends Thousands ... On Cutest Gift Ever

Cover your ears, Justin Bieber -- Hailey Baldwin recently fell so hard in love, she dropped a few thousand bucks to take a little guy home ... for her Mom and Dad's 25th anniversary.

Hailey went to NYC pet shop Citipups, in Chelsea, over the weekend ... and sources tell us she found a new puppy for her parents, Kennya and Stephen Baldwin. The winning pooch is a 3-month-old male Shiba Inu ... which set Hailey back $2,500.

We're told Hailey brought BFFs Kendall Jenner and Jaden Smith with her, and scooped up another $500 worth of accessories and food at the store.

Hailey posted a pic on Shots on Monday ... revealing the furry gift -- even though today is the big day. Surprise or not, Stephen's gonna have his hands full.

The Japanese breed is known for being really smart and yet ... REALLY hard to train.

Enjoy the poop pickup!