Her lack of interest in using the Baldwin name as not stopped her from following in the footsteps of her father and uncles.
The two were all smiles throughout the evening, and Mendes was even spotted sweetly fixing Hailey's gown so she'd look flawless for photographers.
For the occasion, Baldwin wore a completely nude look, consisting of an oversized leather blazer from Frankie Shop with a nude-colored slip dress underneath.