The Clique star headlined his own sold out show at the Joe Louis Arena last week and he thrilled fans by inviting a number of special guests to join him onstage, including Lil Wayne and Jhene Aiko.
However, he saved the best for last as another hometown hero, Eminem, made a guest appearance alongside his longtime collaborator Royce to close out the gig, and Big Sean admits he was so nervous about the last big surprise, he couldn't remember the words to his verse on Detroit vs. Everybody as they ran through the set ahead of Friday's show.
"I kept fumbling because it was such a moment for me," he recalls to the Detroit Free Press. "I had so many things in my head, I couldn't remember my verse. I couldn't think of the words.
"Eminem was there, under the stage, waiting to pop out from underground. I'm just sitting there thinking, 'Wow, I'm onstage with Royce da 5'9, and Eminem is about to pop up.' It was a major moment for me. But I executed it in the show perfectly, and that's what counts."
Big Sean felt all the more honoured to have Eminem perform at his concert because the hip-hop icon is famed for being somewhat of a recluse.
"Eminem hasn't performed (a concert) in 2015 at all," he explains. "He hasn't stepped on a stage (before Friday). When we did Detroit vs. Everybody for his album (Shady XV in 2014), I guess he just really appreciated me doing that for him."
He continues, "He's a great guy. I've been to the studio with him a few times, had a few chances to talk to him. He's a legend - honestly, sometimes I feel like I'm talking to a ghost, how legendary he is. He's here, and then he just disappears. But his presence is felt. He's one of the biggest inspirations to me."
The all-star finale was the icing on the cake for Big Sean, who insists headlining such a historic venue in his native Detroit was a dream come true.
Describing his emotional collapse at the end of the show, he says, "I felt so many emotions. It's just insane for me, man. A complete honour. I was literally brought to the floor onstage because of how blessed I felt to come this far in this city - from being that kid riding past Joe Louis, to being there and doing that."
Calling it "the best day of my life", he adds, "I'll never forget it. Fifty years from now, I'll still remember that night. So I've just got to say thank you to (the artists) who participated."
Proceeds from Friday's concert benefited Big Sean's youth organisation, the Sean Anderson Foundation.