Beyoncé & Jay Z attend Britney Spears show in Vegas...

Looks like Beyoncé was looking for "inspiration" as to how to make millions during a Vegas residency and not actually have to perform bend her knees on stage. 
You never know, such observation could come in handy for that well anticipated Destiny's Child reunion in the next 20-30 years. Of course she could have been overseeing ideas for whatever she has in store for her next album era. Jennifer Lopez did her observation at Brit's show last year before inking her deal. Bey clearly saw what she needed to see last night before departing Britney's show early!

Britney performing last night:

Bey makes her departure: