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Justin Timberlake and Jay-Z: Before The Tour 1

In the early 2000s, the camera loved both headliners whenever they stepped out with their other halves - who just happened to be pop icons Britney Spears and Beyonce Knowles. All eyes were on Timberlake and Spears across award show red carpets and paparazzi turf for a good three years before the stars went their separate ways in 2002. Jay-Z and Beyonce have reigned supreme as hip-hop's ultimate power couple since late 2002 - a romance that heated up after they produced sultry duet "'03 Bonnie and Clyde" earlier that year.

Justin Timberlake and Jay-Z: Before The Tour

Justin Timberlake and Jay-Z kick off their anticipated Legends of the Summer tour at Toronto's Rogers Centre on Thursday, July 17. Look back on the long and winding road to their massive albums The 20/20 Experience and Magna Carta Holy Grail and an alliance that has helped to define the unique sound of Summer 2013. - By Marisa Okano (Twitter: @okrissy)