There is no magic in Equestria now so their hooves can’t be magical. Keeping those cups like that isn’t possible.  
They could have made them hold those cups differently, like holding them between the two hoofs, it would have made more sense.  
Years of theories about hoofs thrown away.

How come Hitch doesn’t get a cup?

@Background Pony #D447  
Actually, I was thinking more along the lines of Jimmy Fallon.

@Background Pony #D447  
You thought the exact same thing as I did.

@Background Pony #CF1D  
Dude, this is a pony cartoon. Ain’t no point in explaining squat.

@Background Pony #CF1D  
(whispers) Hoof magic%%~

How are they holding those cups without hands?

@Myoozik  
Good point- the Pinkie-like one who would usually do that is at the desk.

So who’s the one who’s gonna jump erratically on the sofa?

No… They’re making a make-shift talk show now?!