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"With their joint tour kickoff less than a week away, Rihanna popped by Eminem&amp;#039;s Lollapalooza set Friday to perform a bunch of songs with him. They sang their joint songs &amp;quot;The Monster&amp;quot; and &amp;quot;Love the Way You Lie,&amp;quot; as well as &amp;quot;Stan,&amp;quot; in which RiRi sang the parts normally performed by Dido.  Their &amp;quot;The Monster&amp;quot; tour starts August 7, where they will presumably continue to sing on each other&amp;#039;s songs. I would probably play good money to hear Eminiem sing &amp;quot;Umbrella.&amp;quot;  Watch their other performances:  Follow Alie on Twitter. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cosmopolitan.com/entertainment/news/a29703/rihanna-gave-a-surprise-performance-at-lollapalooza/>