jlobritney460sidebyside.jpgVnC Cocktails

Jennifer Lopez and Britney Spears are two pop stars that can easily make the crowd go wild, and this weekend at Wango Tango sponsored by VnC Cocktails, the ladies didn't disappoint.

The sexy American Idol judge, wearing a sparkly jumpsuit, performed her hit song "On The Floor" ... and despite some audio problems, JLo rocked it out! As for Britney, she didn't perform, but the "Hold It Against Me" singer held her own as host alongside Ryan Seacrest.

See which other newly svelte pop star made an appearance ... after the jump.