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OTRC: Taylor Swift does duet of 'I'm Yours' with Jason Mraz at Los Angeles concert - watch now

Taylor Swift appears in a scene from her music video 'Sparks Fly,' which was released on Aug. 10, 2011. / Jason Mraz performs in concert in Searcy, AR, in October 2010. (Big Machine Records Inc. / Facebook.com/JasonMraz)

Taylor Swift has been making fans go ballistic during her recent shows, first with surprise guest Justin Bieber and now performing a duet with Jason Mraz.

At Swift's August 25th performance at Los Angeles' Staples Center, the singer brought Mraz on stage to perform one of her favorite songs, Mraz's 2008 hit "I'm Yours."

"I couldn't love LA crowds more," Swift wrote on Twitter on Thursday night. I can't believe how awesome tonight was. And thank you @jason_mraz for singing 'I'm Yours' with me!!"

Swift is winding down her four-night stint at the Staples Center and performed several songs which she said reminded her of California, including the Beach Boys' "God Only Knows" and Gwen Stefani's "Sweet Escape."

The singer also performed her biggest hits like "Fifteen," "You Belong With Me," "Mean," "Back to December" and her newest single, "Sparks Fly," which is the fifth single from "Speak Now," Swift's third studio album. The record has sold more than 3 million copies in the United States since its October 2010 release.

On August 23, Justin Bieber surprised Swift's fans by jumping on-stage to sing his hit, "Baby" with Swift.

"You think you've heard LOUD screaming in your life... Then @justinbieber comes out and does a surprise song during your show. Whoah. Unreal," Swift wrote on Twitter, following the performance.

Bieber returned the favor, posting a video (watch below) from their duet with the caption, "@Taylorswift13 has been there from day 1. true friend. #goodtimes."

The 21-year-old Grammy-winning country and pop singer has wowed audiences this summer with her romance-themed U.S. concerts that include stunning costumes, ballet dancers, pyrotechnics, high-wire aerialists and a wedding scene.

In July of this year, Swift's "Speak Now" tour, aimed at promoting the album, sold more tickets via vendor TicketsNow than any other music artist, bumping McCartney, 69, to second place.

The singer recently added 10 Australia and New Zealand shows to her "Speak Now" world tour. The singer's U.S. tour dates are largely sold-old through late November. Check out Swift's tour dates on her official website.

Watch Taylor Swift's duets with Jason Mraz and Justin Bieber below.

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