After photos surfaced of U.S. president Donald Trump's audience with Pope Francis, we all weren't sure why Ivanka and Melania were both dressed in conservative black dresses. There were also a lot of comments about Pope Francis' serious expressions while being photographed with the president.

But one of the most interesting revelations about the papal audience was the first lady's religious beliefs.    

Since Melania Trump introduced her husband with the Lord's Prayer during a Florida presidential rally, speculation has swirled about her stance on religion. We already know that president Donald Trump is Christian and the pair wed in a Florida Episcopal church.

Before the historical visit to Rome, Melania expressed eagerness for the visit, and now we know why. Through her spokeswoman Stephanie Grisham, the first lady revealed that she is a Catholic. While Melania's faith makes the Trumps' visit to Rome even more significant, it also makes her the first Catholic since JFK and Jackie Kennedy to reside in the White House.

During their audience with Pope Francis, Melania asked the pontiff to bless a rosary, further confirming her Catholic faith. After the visit, the first lady tweeted about her experience, saying "Today's visit with His Holiness Pope Francis @Pontifex is one I'll never forget. I was humbled by the honor. Blessings to all."

Watch the video of the Trumps' visit with Pope Francis here:

Go to the next page to find out what else happened on the Trump's Rome visit!

After visiting with the Pope, Melania continued to Bambino Gesí¹ (Baby Jesus) Hospital to visit with sick children. She even paused to leave flowers in front of a statue of the Blessed at the 150-year-old hospital chapel and spent some time in prayer.

Aleteia reported that Melania "blessed herself with holy water, lit a candle, and learned about the history of the chapel."

The first lady also made a special request to have some quiet time to herself.

"She wanted to have some private time for prayer and reflection on her experience here, and the day as a whole," wrote Aleteia.

But Melania wasn't the only Trump who has stopped to pray at a religious site.

Johnnie Moore, one of Trump's evangelical advisers, revealed what Mr. Trump prayed about when he visited the Western Wall in Jerusalem.

He said that the president "marveled at the monument to God's presence" and he prayed "for wisdom from God."

While visiting with sick children at the hospital, Melania met a boy desperate for an organ donor. Just after the first lady left the hospital, she heard some amazing news.

"Upon landing in Belgium, I learned a young boy and his family who had been waiting for a heart transplant was informed that the hospital has found a donor," Melania Trump said in a statement. "I read a book and held hands with this special little one just a few hours ago, and now my own heart is filled with joy over this news."

"To spend time speaking to and coloring with children who have such a positive spirit despite illness was an amazing gift," she said.

"The time I spent with the little ones in the Intensive Care Unit is something I will never forget, and I will pray for each of them daily."