"This guy Nate didn't believe his mom and uncle were meeting me at @Wahlburgers, so I facetimed him on her phone to prove it -- his reaction was everything! Nice to meet you too Nate! Good luck at grad school!" Wahlberg, 47, wrote on Instagram alongside a screenshot of the call.
The picture shows the Blue Bloods star smiling as Nate is covering his mouth in disbelief.
Wahlberg is known for being great to fans. Last month, after dining at a Waffle House in Charlotte, North Carolina, the singer tipped $2,000 on an $82 meal, saying "when the staff treats me like a king, you better believe I treat them like queens!"