Khloe Kardashian After Kim Kardashian's Wedding -- The Party's Over

Khloe Kardashian ditched the family and returned to the U.S. today by herself -- arriving in NYC after Kim and Kanye's wedding.

We're guessing Khloe's just on the East Coast for work (whatever that means for the Kardashians) -- and not fleeing the fam a la Rob.

Meanwhile, Kris and Bruce Jenner flew non-stop from Paris to LAX ... along with Kylie, Kendall ... and, of course, granddaughter North.

Kris was pushing North's stroller as they left the terminal moments ago ... with the usual crush of cameras.

After all that fanfare in Europe ... nothing's changed back home.