No matter how big you get, performing for the Pope will always be a memorable experience, as Gloria Estefan and Sean Paul can attest.

"I got to put that on my resume ... 'Warmed up crowd for the Pope,'" Estefan told ET.

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The GRAMMY winner is set to perform a ballad in Spanish, called "Mas Alla," before Pope Francis' mass at Madison Square Garden on Friday night. Estefan performed the same song for Pope John Paul II in 1995.

"Nervous? Of course!" Estefan confessed. "If you don't get nervous before getting up in front of a lot of people much more so when the Pope is involved then something is wrong with you. You're not human or something."

On Thursday morning, Moby joined forces with Jamaican dancehall rapper Sean Paul, performing a concert for environmental change on the National Mall.

"I want to do my part and talk from my heart," Sean Paul told ET.

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The performance was a part of the Pope Francis Moral Action on Climate Justice Rally.

The papal visit even has action heroes star-struck, as Hugh Jackman gushed to ET about the spiritual leader.

"I love the way he's inclusive," Jackman told ET. "Rather than what divides us, he's always looking at what brings us together."

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One downside to the Pope's visit was the traffic jams, but Jackman told us he's hardly affected since he rides his bike a lot of the time. The 46-year-old actor had nothing but praise for the Pope despite the fact that the pontiff's New York City appearance could have disrupted promotion for his new movie, Pan.

"I know it sort of annoys people but I think it's worth it," Jackman said. "I think he's an amazing man."