Thunberg is currently in the UK, as she prepares to join a school strike in Bristol on Friday (February 28) which will see children skip lessons to protest against climate change.
Yousafzai hinted that she will also attend the momentous occasion, as she tweeted: "She's the only friend I'd skip school for."
But the youngest ever Nobel Prize winner wasn't the only one excited to meet up.
Thunberg, 17, also shared a photograph of the duo on Instagram alongside the touching caption: "So... today I met my role model. What else can I say? @malala".
Both Yousafzai and Thunberg became global power figures in their teenage years.
Yousafzai was shot as part of an assassination attempt aged 15 after writing a blog about her life in Pakistan under Taliban occupation.
She was transferred to the UK for treatment where she now lives and studies.
Meanwhile, Thunberg was also just 15-years-old when she kickstarted a global youth-based climate change movement after staging a protest outside of Swedish parliament back in 2018.