Posting an Instagram video of the surprise, the MYX VJ wrote on the caption, "She's here for school, and has never been away this long from home. She had no idea."
Hannah, who is a popular YouTuber, cried tears of joy when she saw Donny pop out behind a car.
Hannah is the third child of Anthony Pangilinan and Maricel Laxa and is studying a one-year Music and Film course in Sydney.
Donny once expressed to PEP.ph how proud he is of his sister.
In March 2018, he said, "Magaling kumanta 'yon, magaling din sumayaw, and magaling din umarte.
"Nasa kanya na lahat so I'm proud of Hannah. Kahit ano kaya niyang gawin."
Among the five Laxa-Pangilinan children, only Donny and Hannah have shown interest in showbiz.
But for now, Hannah chose to focus on her studies.
As a big brother, Donny admitted that he isn't "too strict."
The ABS-CBN host-actor added, "Basta lahat ng ginagawa niya, very supportive ako."