With her revealing green Grammy gown now the stuff of legend, Jennifer Lopez will have a hard time topping herself at the upcoming MTV Video Music Awards (Sept. 7, 8 pm/ET). But despite the high expectations, the actress/pop star, whose video for "Waiting for Tonight" is up for two awards, admits that deciding what to wear to the ceremony is, at this point, a low priority.

"I don't do that type of thing until a couple days before," Lopez tells TV Guide Online. "It's like I start looking at things and I choose something or I choose a couple of things and then that day I choose what I'm going to wear." Regarding her headline-grabbing Versace number, she says "that took on a life of its own. I wasn't trying to top anything. I just don't think about [things] that way."

Well, Lopez's wardrobe once again is front-page news. In her new film, The Cell ? in which she plays a psychologist who hitches a ride inside the mind of a deranged serial killer (played by Vincent D'Onofrio) ? the Latina sensation is draped in a series of lavish costumes that would put Liberace to shame. But while the outrageous outfits may be an awesome sight, wearing them was no day at the Grammys.

"Some of them were kind of uncomfortable and big," the Out of Sight star says of the costumes, created by Academy Award-winning designer Eiko Ishioka (Bram Stoker's Dracula). "I [thought] 'Can I do the scenes in this?' But as far as her concept and the artistry that went into them, they were amazing."