American superstar sprinter Sydney McLaughlin clocked in at 51.46 in the 400-meter hurdles at the Tokyo Olympics and broke her own world record to win her first Olympic gold medal on Wednesday.

Millions of fans across the world tuned in to watch McLaughlin run, but the watch party at her alma mater – Union Catholic High School in Scotch Plains, New Jersey – may have been one of the most epic scenes yet.

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McLaughlin, who graduated from Union Catholic in 2017, said it was "an awesome opportunity being able to represent them all back home."

AMERICAN OLYMPIC GOLD MEDALIST SYDNEY MCLAUGHLIN 'GRATEFUL TO BE ABLE TO REPRESENT MY COUNTRY'

"The entire Union Catholic community is super excited and very proud of Sydney," Sister Percylee Hart, the principal of Union Catholic, told MyCentralJersey.com. "To see her win a gold medal and break the world record was such an amazing moment… Sydney has been blessed with a gift and seeing her become all that God calls her to be is very fulfilling."

Sydney McLaughlin, left, of the United States, embraces compatriot Dalilah Muhammad, after their semifinal of the women's 400-meters at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo. (AP Photo/David J. Phillip)

Sydney McLaughlin, left, of the United States, embraces compatriot Dalilah Muhammad, after their semifinal of the women's 400-meters at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo. (AP Photo/David J. Phillip)

According to the website, the Union Catholic community gathered at the Stage House Tavern in Mountainside, New Jersey on Tuesday night to watch McLaughlin win her first gold medal.

"To have so many members of our community gather together last night to cheer for Sydney and support Sydney was so heartwarming,'' Sister Percylee told the site.

Gold medalist Sydney McLaughlin, of the United States, celebrates after winning the women's 400-meter hurdles at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Gold medalist Sydney McLaughlin, of the United States, celebrates after winning the women's 400-meter hurdles at the 2020 Summer Olympics, Wednesday, Aug. 4, 2021, in Tokyo, Japan. (AP Photo/Petr David Josek)

Union Catholic's Twitter page also reacted to McLaughlin's victory.

"WOW!!!!! UC LEGEND SYDNEY MCLAUGHLIN WINS THE GOLD!!!! AND SHE BREAKS THE WORLD RECORD!!! HOW AWESOME IS THAT!! WHAT A MAGICAL MOMENT!!!! CONGRATS, SYDNEY!!!!!!!" the school wrote.

McLaughlin came from behind to run down fellow American Dalilah Muhammad after the very last hurdle. Muhammad finished with a 51.58, which also broke the original world record but finished behind the 21-year-old New Jersey native.

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McLaughlin also won gold in the 2019 World Championships in the 4x400-meter relay and a silver medal in the same competition in the 400-meter hurdles.

Muhammad won a gold medal in the 400-meter hurdles in the 2016 Rio Games as well as gold in the same event in the 2019 World Championships.

Fox News' Ryan Gaydos contributed to this report.