Rihanna recently joined Eminem at Lollapalooza 2014 and performed the choruses of songs namely 'Love the Way You Lie' and 'The Monster'.
The 'Umbrella' hitmaker also crooned Dido's vocal parts for the rapper's hit song 'Stan', Contactmusic reported.
The 28 song set at the fest included Eminem's entire career from his 1998 debut The Slim Shady LP to his last year release The Marshall Mathers LP 2.
