Model Gigi Hadid's�Star-Studded 21st�Birthday Party...(PHOTOS)

She had all of her celebrity pals and her close-knit family in attendance.

But there was one guest that was top of Gigi Hadid's list as she celebrated her 21st birthday with a star-studded bash at Hollywood hotspot The Nice Guy on Thursday night, her boyfriend Zayn Malik.

And luckily for the birthday girl, he was on hand to help her out of the restaurant as she stumbled home in the early hours of the morning before he was rewarded with a very amorous display in the back of the car.