Taylor Swift and Justin Bieber wrote a song together? - OnTheRedCarpet.com

<div id="bodyText" readability="75.3009708738"> <p>Taylor Swift caused a frenzy this week when she had Justin Bieber join her on-stage at her concert and now the pop stars are collaborating on music together, according to their producer friend Kuk Harrell.</p><p> "Wow!! Got to see @justinbieber &amp; @taylorswift13 write a song together last night!! SMASH!!!! SMASH!!! SMASH!!! Let's do it again Yall!!!" Harrell wrote on Twitter on Saturday, which Bieber re-Tweeted.</p><p> On Friday evening, Bieber cryptically wrote, "#writing."</p><p> Thaddis "Kuk" Harrell is a songwriter and vocal producer who has worked with Jennifer Lopez, Beyonce, Mary J. Blige and Rihanna. He has won five Grammy Awards for his involvement in Beyonce's "Single Ladies (Put a Ring on It)," Mary J. Blige's "Growing Pains" and Rihanna's "Umbrella," which he co-wrote.</p><p> On August 23, Justin Bieber surprised Swift's fans by jumping on-stage to sing his hit, "Baby" with Swift, during her concert at Los Angeles' Staples Center.</p><p> "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.</p><p> 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."</p><p> 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.</p><p> 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.</p><p> The singer recently released the 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.</p><p> 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.</p></div><p> (Copyright ©2011 OnTheRedCarpet.com. All Rights Reserved.) </p>