Jennifer Lopez surprises crowd at 'We Day' with greatest hits performance...

As much as 20,000 students got their life when Jennifer Lopez made a surprise appearance and performed a medley of her greatest hits on stage.

The booty shaking performance took place at the 2014 We Day, held at the Rogers Arena on October 22nd in Vancouver, Canada. The event was hosted by fellow Latina Selena Gomez.
 
We Day brings young people together to celebrate the actions they are taking in their local and global communities. It is also to inspire another year of change by sharing the passion of world leaders and entertainers. Watch J.Lo serving up something fierce with her performance below.

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