"A little work will be fun! Feels really good," Gustaf, the eldest son to the PM and his wife Filippa Reinfeldt, said on his Twitter feed.
The junior Reinfeldt continued to confirm that he is to ply his trade at the Kungsgatan branch of the global fast-food chain, offering Stockholmers the chance to be served by a member of one of the most well-known families in Swedish society.
"Drop by and have a hamburger," he urged one of his Twitter followers.
Tuesday's announcement of his impending McDonald's employment is not the first time that Gustaf Reinfeldt's online activities have thrust him into the public eye.
In February 2009, he joined a Facebook group "Free The Pirate Bay", taking a highly publicised stand in favour of the controversial founders of the popular file sharing site ahead of their trial for copyright violations.
He is also a member of the Moderate Party's youth league Muf, an organisation which supports the de-criminalisation of file-sharing for private use.
Despite the press attention and possible PR value of having recruiting the PM's son, McDonald's Sweden has played down the significance of the appointment.
"It doesn't matter who you are or what you are called. He is a team member and we don't comment on these things," said Frida Berg at McDonald's Sweden to Nyheter24.