Jennifer Lopez Scores Big Vegas Payday Residency Looms

1/9/2015 1:00 AM PST

Jennifer Lopez passed the "Vegas Residency Test" with flying colors on New Year's Eve, and in the process scored more than $400K. 

Our Vegas sources tell us ... Lopez raked in $410,000 for her NYE performance at Caesars Palace, plus she gets back end. Even though the show was sold out, the venue only netted slightly more than $600K. 

It's still good, and our sources say the point of the gig was to see if Lopez was a sufficient draw for a full-on residency.  

To put Lopez's payday in context, Britney makes around $475K a show with her new contract.

We're told Caesars was pleased.