What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
As the mop-haired honey was spotted heading into a recording studio Tuesday in London with the rest of One Direction (above)!
Now that the band has signed on to handle each other's microphones for three more years, they've gotta start churning out hit-making tunes on the regular.
Forget until she writes an annoyingly infectious single about it, of course.
Ch-ch-check out more snaps of the boys about to make some sweet tunes (below)!
[Image via WENN.]