“It’s official, I left my heart in Lisbon. My first time in Portugal and you all made me feel like I was right at home”, she wrote on social media.

Adding: “I’ll seriously never forget the way you treated us, the overwhelming love and passion and hands in the air and dancing and how you screamed every lyric!! Muito Obrigada.”

The American singer promised to return to Portugal and, in an emotional speech, said that she had 'regretted' never performing in the country before.