Heidi Klum, a judge on 'America's Got Talent,' was moved to tears by an emotional performance: 'It was difficult to watch.'

An emotional performance on "America's Got Talent" resulted in several tears being shed.

On Wednesday night, Sky Elements' drone act left the "America's Got Talent" judges speechless and in tears during the semifinals.

Heidi Klum, judge on "America's Got Talent," shared with Planet Chronicle Digital that it was difficult to watch the show.

"Watching it was difficult and I couldn't help but cry," Klum confessed. "As a result, all my eyelashes fell off, making it even more emotional for all of us."

In the semifinals of 'AGT,' Heidi Klum was moved to tears by an emotional act.

An outdoor drone performance by Sky Elements lit up the sky in memory of Preston Ward's late daughter, Briley Rose.

The emotional story of a father losing his daughter was conveyed through a moving tribute that included a giant rose and butterflies.

The judges and audience were moved to tears throughout the "America's Got Talent" performance. When the act ended, Simon Cowell was left speechless.

WATCH: ‘AGT’ JUDGE HOWIE MANDEL SAYS EMOTIONAL ACT 'BROKE ME'

Howie Mandel was equally moved by the captivating performance.

Mandel told Planet Chronicle Digital, "The drone show. My God. That broke me."

The "America's Got Talent" judge was more emotional after Sky Elements performed on Sept. 11, as it was the anniversary of the tragic attacks that resulted in a significant loss of loved ones.

Mandel stated, "It's both heartbreaking and wonderful."

"As a parent and a human, I reside in America. The experience met numerous criteria. Primarily, it elicited sadness, tears, and an array of emotions."

In the "America's Got Talent" semifinals, Sofía Vergara was also impacted by Sky Elements' performance.

Vergara remarked on the show, "Who knew drones could evoke such strong emotions in people?"

"Wow, that was unexpected and stunning! I can't express how much I appreciate it. Congratulations on your excellent work!"

Before the semifinals, Cowell advised Sky Elements to give an emotional performance, as told by Planet Chronicle Digital.

"Simon was moved to tears after the quarterfinals because we brought emotion into our performance," Sky Elements members noted. "I'm thrilled that we were able to achieve that. I didn't anticipate him being speechless, though. That was an unexpected but impressive outcome. I believe we executed our performance flawlessly."

WATCH: ‘AGT’ PERFORMERS SKY ELEMENTS LEFT JUDGES IN TEARS

Sky Elements reported an "influx" of support for their impressive performance.

"The perfect moment and day for that story to be told was on a day of remembrance, as many people struggled on that day," Sky Elements stated.

The six remaining acts will join the four Live Show Golden Buzzers in the finale on Sept. 17.

On September 24th, NBC will reveal the winner of "America's Got Talent" for the current season.