Inter's win on Saturday against Curtone all but wrapped up the Serie A title and Atalanta's failure to beat Sassuolo confirmed the win for Antonio Conte's side.
The win ended fierce rival's Juventus' nine titles in-a-row stretch and earned the Nerazzurri their first title in 11 years, when they won the Treble under Jose Mourinho.
Lukaku has been integral to the team's success this season, scoring 21 goals and assisting 10 more in 33 appearances, putting him behind only Cristiano Ronaldo in goals scored this season.
After the Atalanta game, Lukaku celebrated from the window of his apartment singing 'Championes ole ole ole,' and taking to the streets of Milan to continue his singing.
Lukaku celebrating in the streets of Milan ❣️:trophy: congratulations Inter pic.twitter.com/I66Pe0irN3- FootballPlanet (@FootballPlane17) May 2, 2021
Speaking about his celebration, he told Sky Sports Italia, "I'm really proud to be an Inter player. I've a special feeling with this club, that's why I decided to celebrate around the city today with our fans."
The 27-year-old's last league title came the same year as Inter's previous triumph. The former Manchester United striker won the Belgian Pro League with Anderlecht in 2010 and has been without success since.
He has been in incredible form since his €80 million move to Italy in August 2019, scoring 44 goals in his nice 69 games in the league.
The Belgian got one over former United teammate Zlatan Ibrahimovic earlier this season when the two men clashed during the Milan derby.
As well as celebrating in the streets of the city, Lukaku managed to make time to take another dig at the Swede on social media.
It's not all been plain sailing for the former Everton striker since moving to Italy, he has been on the receiving end of racism on more than one occasion.
No one can keep him down though, with his goals and excellent performances leading Conte's side to a much needed title.
It might only be the start of his domination of Serie A!
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