Johnson Wen, who is known as Pyjama Man on Instagram, jumped a security barrier, rushed over to the Thank U Next hitmaker and put his arm around her before security and her co-star Cynthia Erivo intervened at the event on November 13.
He was put on a plane out of the Southeast Asian country on Sunday and has also been barred from re-entry, according to Singapore-based English language newspaper The Straits Times.
Wen had been sentenced to nine days in jail after pleading guilty to one charge of being a public nuisance.
Prosecutors had described Pyjamaman as a "serial intruder" who had previously carried out similar stunts with the likes of Katy Perry and The Weeknd, 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.
"I feel like I'm in a dream," Hee said.
"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]"
Following 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 pal.
"I was really thinking, I just wanted to make sure my friend was safe," the 38-year-old star said of the incident on US show Today.
"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."
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