The actress, 23, dared to bare in a black silky gown which gave onlookers more than a hint of her toned - and braless! - body.
And, as if the sexy Christian Dior Couture gown didn't make enough of a statement on its own, she also channelled her inner vamp with very dark red lips and bold eye make-up. We like very much!
With her newly-cut blonde hair, Jennifer was also able to show off a striking ear cuff, which was the only accessory she needed to complete the eye-catching outfit.
The star, who plays heroine Katniss Everdeen in the film franchise, attended the event last night (15 November) at Le Grand Rex with fellow co-stars Liam Hemsworth, Josh Hutcherson and Elizabeth Banks.
In The Hunger Games: Catching Fire, Katniss becomes a target of the Capitol after her victory in the 74th Hunger Games sparks a rebellion in the Districts of Panem.
The glitzy premiere comes just days after Jennifer criticised TV show Fashion Police, saying:
"[Shows like that] put values in all the things that are wrong and [say] that it's OK to point at people and call them ugly and call them fat and they call it 'fun' and 'welcome to the real world'. And it's like, that shouldn't be the real world."
She added: "That's going to keep being the real world if you keep it that way. It's not until we stop treating each other like that and just stop calling each other fat... With these unrealistic expectations for women."
Fashion Police star Joan Rivers then hit back, calling Jennifer "arrogant".
What do you think of Jennifer's flashy outfit? Tell us below!