The 34-year-old actress shared a clip on her social media accounts in which she and the "Wolverine" star are seen hanging out together at the backstage.
"Backstage madness @RealHughJackman @Deborra_lee," she captioned the video.
Jackman, 47, also expressed his excitement for the festival on the micro-blogging site.
"Always an awesome festival! Five years and counting. @Hughcevans and the ENTIRE TEAM @GlblCtzn thank you. You are the best," he wrote.
The festival which happened last evening at Central Park in New York city, witnessed R&B singer Rihanna, rapper Kendrick Lamar, Electronic band Major Lazer and Metallica.
Martin and Priyanka shared the stage to talk about his band's upcoming maiden concert in India as a part of the Global Citizen Festival.