The blonde star, dressed in a white strapless Dior gown, tenderly wrapped her arms around Nicholas and embraced him before heading up on stage at the Beverly Hilton Hotel.
It was her second victory of the evening having scooped the Best Supporting Actress award for the film - according to HollywoodLife, when Jennifer’s name was read out, Nicholas was seen mouthing, "Well done baby."
Their public embrace came as a surprise to many given that they are a notoriously private couple. Jennifer’s American Hustle co-star Bradley Cooper, who was sat beside the smitten stars, appeared touched by their show of affection, and was seen smiling as they leaned in for the kiss.
It was by no means the only sweet moment between Jennifer, 23, and Nicholas, 24. Throughout the evening, the adorable pair were seen leaning in whispering sweetly to one another, and giggling as they cuddled up together.
Jennifer and Nicholas met in 2011 on the set of X-Men: First Class. They split up in January 2013, but had rekindled their romance by July after working together on X-Men: Days of Future Past.