'Sweet' Lowdown

Does art mirror reality in America's Sweethearts -- in which Catherine Zeta-Jones and John Cusack play self-indulgent celebs? Sometimes, say Sweethearts' stars, tapped at the flick's L.A. premiere. Zeta-Jones admits to asking her assistant to perform a demeaning task -- as she does of Julia Roberts' character -- and later regretting it. ''I actually asked my assistant to get me a pregnancy test,'' she says, ''but that was a long time ago.'' Cracks Cusack: ''I asked [mine] to go to Indonesia to pick up some China White heroin. She said no.'' Also in the movie, Billy Crystal's agent character coordinates the arrival order of stars to a press event -- with the last being top of the heap. Is there a hierarchy? ''It just happened now,'' says Crystal. ''They told me, 'No one's there yet. You don't want to be first.' So we cruised around the block a few times. I actually got here last night.'' And Seth Green notes: ''They usually tell me to show up before everyone else does.'' Turns out Roberts was unavailable to answer questions: The last to arrive, she had no time.