By Sandra Rose  | 

ROBYN BECK/AFP via Getty Images

The tension between Will Smith, Jada Pinkett Smith and Chris Rock began years before the A-list actor pimp slapped the stunned comedian in front of millions watching on national TV Sunday night.

The incident sparked debates online, as some viewers wondered if the slap was fake.

Analysts slowed down the video frame-by-frame and they claim Rock braced for the slap.

However, body language experts point to one huge clue that the slap was indeed real.

Myung Chun / L.A. Times via Getty Images

Body language expert Judi James told The Sun that Smith's initial response was a "subdued performed laughter" while Pinkett Smith's smile faded and her torso stiffened.

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James said Smith's initial laughter was "subdued performed laughter" until he saw the distress on his wife's face and he reacted emotionally.

The body language expert said Rock didn't expect to be slapped by Smith.

She said: "His hands were clasped behind his back and he was laughing right up until the blow landed."

Pinkett Smith, 50, announced her struggle with hair loss in 2018. She had been the butt of Rock's jokes long before that.

While many say Smith was wrong for attacking the Oscar's presenter, insiders whisper that Pinkett Smith has "rejected [Rock's] sexual advances for years."

The bullying finally got to Smith and he put a stop to it in the only way bullies understand - through violence.

James claimed that Smith had a "smug" smile when returning to his seat after smacking the comic.

Will yelled: "Leave my wife's name out your f***ing mouth."

James said that Smith spewed profanity at Rock with "true anger" in his voice.

"Someone who works for the Oscars told me that Chris Rock was not interrupted by Will Smith at rehearsals yesterday," a source tells The Sun. "It was not supposed to happen. It was real."