This is one fashionable couple!

Hailey Baldwin was ballin' in Balenciaga, on Thursday, sporting $950 Balenciaga Square Knife neon green pumps and a $630 Explorer Pouch. She wore baggy boyfriend jeans paired with a tight white tee and a khaki blazer. She looked f-ing AMAZING! Who's her stylist?!

Meanwhile hubby Justin Bieber was wearing his own label -- a Drew hoodie -- paired with red Converse high-tops and a Guess Jeans x J Balvin cap ... which is cute! Biebs is promoting his own brand AND his "Sorry (Remix) pal's collab. And it was SO funny -- Justin had the valet at the Waldorf-Astoria in Beverly Hills take a shot of him in front of his $500K Lamborghini Urus SUV. Will he post it?