The actress, 22, attended the famous sci-fi convention in San Diego on Sunday (July 21) and chose to wear a Proenza Schouler girlie white skirt with monochrome cropped top that showed off her toned tum.
At Comic-Con International 2013 to promote The Hunger Games: Catching Fire, Jennifer joined her fellow cast members including Josh Hutcherson, who stars as her on-screen love interest.
In reality, Jennifer is said to have recently reunited with ex-boyfriend Nicholas Hoult.
Former Skins star Nicholas is at the event to promote the new X-Men film, Days Of Future Past - which also stars Jennifer.
Reports say the pair have rekindled their romance on set. We do hope the rumours are true!
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