Priyanka, who is the goodwill ambassador for UNICEF, shared a picture with Yousufzai on Instagram and hailed her for her efforts in empowering and inspiring young girls.
"I could write a novel about how smart, incredible, inspiring, encouraging and funny this young woman is... But I will keep it brief. Malala, you are an undeniable force to be reckoned with. The world knows that. You are a role model to all the girls and boys that want to make this world a better place for the future.
The 35-year-old actor was quick to reply, tweeting, "Oh Malala no words will be enough...I can't believe I..met..U!! (sic) You're just a young girl with so much heart..and such achievements.so proud."
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Priyanka also met American feminist and social political activist Gloria Steinem at the United Nations.
"It's was so incredible to be on a panel with @gloriasteinem. An icon to the world and definitely one of mine all my life. A true feminist," she wrote along side a picture with Steinem.
Priyanka is currently in UN where she recently addressed the global leaders and urged everyone to educate and create opportunities for young girls and children.