The Roc was in the building as Jay-Z headlined Radio 1's Hackney Weekend 2012 in London on Saturday (June 23). The hip-hop king was joined by his Throne partner Kanye West during his show-stopping performance.

The rap tandem performed a slew of tracks from their celebrated album 'Watch the Throne' including 'Otis,' 'Who's Gonna Stop Me,' 'Welcome to the Jungle' and ' Lift Off.' During Yeezy and Hov's performance of 'N---as in Paris,' Beyonce literally went bonkers and moshed with hundreds of fans in the crowd. That s--- was definitely cray!

Barbadian songbird Rihanna also came through and joined Jay-Z for a roaring rendition of 'Run This Town.'

Other artists rocking the first half of the Hackney Weekend were Roc Nation singer Rita Ora and Young Money rapstress Nicki Minaj. Ora, dressed in what looks like a pajama outfit and Air Jordan kicks, sung her U.K. No. 1 hit 'R.I.P,' as well as her party anthem 'How We Do.'

Meanwhile, Minaj graced the stage for her London Barbz and performed Peter Rosenberg's favorite song, 'Starships.' The now blonde-haired Harajuku Barbie was dressed in an all-black bodysuit and pink boots. Behind four shirtless male backup dancers, Minaj got the crowd hyped to her polarizing pop track. Londoners were certainly flying high during Minaj's energetic performance.

Watch the videos below.

Watch Jay-Z + Rihanna Perform 'Run This Town' at Hackney Weekend 2012

Watch Nicki Minaj Perform 'Starships' at Hackney Weekend 2012

Watch Rita Ora Perform 'R.I.P.' at Hackney Weekend 2012