Kendall Jenner and Hailey Bieber left their men at home on Monday ... and then proceeded to have a helluva girls night out at the Lakers game!!
The A-list duo -- sans Justin Bieber and Bad Bunny -- sat in courtside seats with friends as LeBron James and Co. took on the Oklahoma City Thunder ... and it seems there wasn't one moment where they weren't enjoying themselves.
Cameras spotted Kendall sippin' from a custom cup with her 818 tequila logo on it .