The X Factor: When you're invited onto the stage to sing with Jessie J, you know you're heading in the right direction -- and that's what happened to Little Mix this week. Our Jesy, Jade, Perrie and Leigh-Anne are hitting the dance floor with Rihanna's Don't Stop The Music but is it enough to win them another week in The X Factor? Buy this performance from iTunes: http://bit.ly/rTCq70