The “Thor: Ragnarok” premiere took place last Tuesday in Hollywood, and stars Chris Hemsworth, Mark Ruffalo, Tom Hiddleston, Cate Blanchett, and more walked the red carpet and greeted excited Marvel fans before watching the film.

Mark Ruffalo forgets to turn his Instagram live-stream off during movie

The 49-year old actor live-streamed the red carpet event of the “Thor: Ragnarok” premiere for fans on Instagram Live.

The actor started streaming in the car, on the way to the event with his wife, Sunrise Coigney, and three kids. Ruffalo’s live-feed was adorable, with his two daughters, Odette and Bella, sitting in the back of his car, and son, Keen, sitting on his lap. Ruffalo proceeded to give shout-outs to his Instagram Live viewers, while fumbling with their usernames.

“This is my first time using this. I’m a little naive.

I don’t really know how to do it. Is it working?” The actor cheekily admitted.

He also streamed while getting out of his car and greeting fans as he walked down the red carpet. Upon entering the theater, Ruffalo must have intended to turn the stream off, but it continued broadcasting in his pocket during the movie.

About 2,500 live-stream viewers were treated to the first few minutes of the film. Robert Downey Jr.’s voice can be heard, as well as laughter from Ruffalo and audience members.

Twitter went into a frenzy. Hundreds of fans tried tweeting Ruffalo to get his attention. Others were just curious to see how long the stream would last until the actor finally noticed. Ruffalo’s Instagram Live continued to stream about 15 minutes into the movie until it finally cut.

Other spoiler moments from Marvel actors

The mistake was hilarious and gave Twitter a good laugh.

Hopefully Marvel Studios will forgive Ruffalo's slip as an innocent mistake.

Understandably, Marvel Studios is incredibly strict when it comes to spoilers, yet the occasional slip-up still manages to occur. This isn't the Hulk actor’s only spoiler blunder. Last July, while sitting down with "Good Morning America," Ruffalo accidentally revealed which heroes die in "Avengers: Infinity War."

Co-star Tom Holland got into trouble multiple times for revealing details of the upcoming Spiderman movies by accident.

"The funny thing about that movie is I showed up and I was like, 'Can I read the script?' And they were like, 'No, you're terrible at keeping secrets,'” Holland told Comicbook.

Although Holland was once dubbed the "King of Spoilers" by Marvel fans, he might have just had his crown taken by Ruffalo.

"Thor: Ragnarok" is set to be released on November 3.

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