&lt;p&gt;Kelly Rowland rocked the stage with Nelly in a UK first as part of the explosive line-up for Radio One's Big Weekend. &lt;/p&gt;  &lt;p&gt; &lt;/p&gt;  &lt;p&gt;The Destiny's Child star made a surprise appearance with best mate Nelly as he began smash-hit dilemma on the main stage.&lt;/p&gt;  &lt;p&gt; &lt;/p&gt;  &lt;p&gt;The St Louis star had thousands of fans screaming as he invited three girls on to the stage with him, launched his legendary red cap into the crowd and threw some sexy shapes on the stage floor.&lt;/p&gt;