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At the ceremony earlier today, Lopez sang a patriotic rendition of 'This Land Is Your Land' and 'America The Beautiful'.
Midway through, the 51-year-old broke from song to deliver a phrase in Spanish, which was: "Una nacion, bajo Dios, indivisible, con libertad y justicia para todos."
After various pleas on social media for someone to translate what she said for the world's non-Spanish speakers, it's transpired that the singer and actor - who is of Puerto Rican descent - was quoting the Pledge of Allegiance, saying: "One nation under God, indivisible, with liberty and justice for all."
Many people have praised Lopez for using the opportunity to share an important message in the Spanish language, with some taking to Twitter to say it even brought tears to their eyes.
One person said: "When Jennifer Lopez broke out the Spanish, I started crying. This is beautiful."
Someone else wrote: "Jennifer Lopez speaking Spanish on the inaugural stage just gave me goosebumps."
Another tweeted: "Jennifer Lopez @JLo, as a Latin woman you had me crying when you sang in Spanish. Thank you."
A fourth added: "Thank you @JLo for your amazing performance at the inauguration. Including a Spanish snippet of the Pledge of Allegiance within the performance reminds Americans that this is a nation of immigrants!"
Ahead of her performance, Lopez shared a selfie with National Guard troops in Washington DC, saying on social media: "What an honor to spend a few moments with these brave men and women. Thank you for your service and sacrifice. I honor you today and everyday.
"Tomorrow I sing for you and all Americans."
Her appearance followed a rendition of 'The Star-Spangled Banner' by Lady Gaga, who said it was an 'honor' to sing at the inauguration.
Tweeting ahead of her performance, Gaga wrote: "Singing our National Anthem for the American People is my honor. I will sing during a ceremony, a transition, a moment of change - between POTUS 45 and 46. For me, this has great meaning.
"My intention is to acknowledge our past, be healing for our present, and passionate for a future where we work together lovingly. I will sing to the hearts of all people who live on this land."
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