Prosecutors had described Pyjamaman – who had previously carried out similar stunts on Katy Perry and The Weeknd – as a “serial intruder”, and a judge determined he had planned the incident in order to go viral on social media.
The red carpet crasher had hinted about his plans before the premiere.
He said: “I feel like I’m in a dream.
“That’s my best friend Ariana Grande and I’m going to meet her. I’ve been dreaming about that.”
He was arrested but later took to Instagram to “thank” Grande.
Sharing a video of the incident, he wrote: “@arianagrande @wickedmovie Dear Ariana Grande Thank You for letting me Jump on the Yellow Carpet with You [heart emoji]”
After the incident, he wrote on his Instagram Stories: “I’m free after being arrested.”
Erivo was praised for her quick reactions to the gatecrasher, who she pushed away from Grande and recently explained she acted instinctively in order to protect her friend.
Speaking on Today, the 38-year-old star said of the incident: “I was really thinking, I just wanted to make sure my friend was safe.
“I’m sure he didn’t mean us harm, but I just, you never know with those things and I wanted to make sure that she was okay. That was my first instinct.”
Erivo previously touched on the incident when she reflected on the bond she and Grande share.
Speaking at a special Screen Actors Guild screening held at the Television Academy in Los Angeles, she said: “What’s even more wonderful is the fact that there are other people who have seen themselves in this movie, in that character, and also now see themselves and feel safe.
“That, for me, is the pinnacle of what I could ever wish for from any piece of work I have ever done. And I am so glad that in order to do it, I had to look into the eyes of this person beside me.
“And we have come through some s***. We have come through some stuff in our lives, in our daily workings.
“I mean, f***, even this last week. Let’s be honest, for f**’s sakes, we’ve had to really deal with some stuff, and this movie has allowed us to really grow as people, as friends, as sisters, as artists, as actresses.”
As Erivo spoke, Grande nodded her head, but when she started talking about the incident in Singapore, the singer stared straight ahead before growing tearful.