Looking gorgeous in a Christian Dior gown, the Hollywood star was all smiles as she accepted the 'Best Actress' prize for her role in The Silver Linings Playbook on Sunday night (27 January).
The Hunger Games actress Jennifer - who took to the stage with Silver Linings Playbook co-star Bradley Cooper during the night - joked to E! News at the event: "I have walking pneumonia; it's highly contagious. I'm fine now."
Rumours that Jen, 22, might be too ill to attend the glitzy ceremony surfaced over the weekend when her Silver Linings Playbook co-star Jacki Weaver had to accept a prize on her behalf at the Australian Academy of Cinema and Television Awards.
Collecting the Best Actress trophy for Jennifer on Saturday, Jacki told the audience: "Poor Jen is really sick. She really is sick. She has pneumonia."
The movie's producer Bruce Cohen added to American magazine Us Weekly that Jennifer had been working herself so hard with red carpet appearances in recent weeks that she hadn't had enough sleep.
Thankfully it seems like Jennifer is on the road to recovery… we're guessing she wouldn't have attended a packed red carpet ceremony if she was still feeling too ill.
If only we looked as glamorous when we're battling the tail end of an illness...
> Kelly Osbourne is our beauty favourite at the Screen Actors Guild Awards
> Our favourite Golden Globe Awards dresses
The SAG Awards winners:
Cast in a motion picture
Male actor in leading role
Daniel Day-Lewis, Lincoln
Female actor in a leading role
Jennifer Lawrence, Silver Linings Playbook
Male actor in a supporting role
Tommy Lee Jones, Lincoln
Female actor in a supporting role
Anne Hathaway, Les Miserables
Ensemble in a TV drama series
Ensemble in a TV comedy series
Male actor in a drama series
Bryan Cranston, Breaking Bad
Female actor in a drama series
Claire Danes, Homeland
Male actor in a comedy series
Alec Baldwin, 30 Rock
Female actor in a comedy series
Tina Fey, 30 Rock
Male actor in a TV movie or miniseries
Kevin Costner, Hatfields & McCoys
Female actor in a TV movie or miniseries
Julianne Moore, Game Change
Stunt ensemble TV