Anthony Bourdain posted a photo on Instagram on Monday showing him dining with U.S. President Barack Obama.
The image captured the pair enjoying a casual meal in a busy restaurant in Hanoi.
Obama is seen with his shirt sleeves rolled up and a beer in his hand.
The other diners don't seem to recognize or be distracted by the American commander-in-chief.
He announced Monday that the Peace Corps will work in Vietnam for the first time.
He also said a decades-long arms embargo against the country will be lifted.