The duo performed Lloyd's track "Want you back", reports femalefirst.co.uk.
Swift, 23, called the collaboration her favourite moment of the gig.
She took to microblogging website Twitter to share her excitement.
"One of my favorite moments of the night was @CherLloyd coming out to sing 'Want U Back'. The crowd went insane! And she's such a fun girl! To everyone who came to the show tonight in LA, I adore you. To anyone coming to the next 3 shows, expect more of the unexpected," tweeted Swift.
Even Lloyd, 20, was thrilled to perform with the pop sensation as she posted a photograph of the duo hugging and smiling together backstage.
The caption read: "Had the most amazing time performing with @taylorswift13. She's the sweetest girl I've ever met! Loved it!"
--IANS (Posted on 21-08-2013)