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It's been almost five years since Jay-Z and Beyoncé Knowles released a collaboration, but they're breaking their cold streak. Hip-hop's royal couple has allegedly recorded vocals on the same track for Dr. Dre's mythical 'Detox' album, with Jay and Dre taking on verse duties and the R&B singer holding it down on the chorus.

"Jay and Dre have recorded their verses with the chorus left open for Beyonce to sing," a source told The Sun.

The last time that Jay and Bey graced the same song was on Hov's 2007 album 'American Gangster' on the track 'Pray,' though she relegated her contribution to spoken word instead of singing. Together, they have earned some of the biggest hits of their career, with Beyoncé's breakout solo single 'Crazy in Love' topping the charts in 2003 and Jay's ''03 Bonnie & Clyde' became his second top-10 single as a solo artist.

Dr. Dre has been working on his third and last album for over a decade, putting in studio time with everyone from Akon and Snoop Dogg on the single 'Kush,' to Lil' Kim, Eminem, T.I., Raekwon, Common and a slew of others. In January, he revealed that he will finally release the elusive album on April 20.

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