In this Thursday, Oct. 26, 2006 file photo, Paris Hilton talks to reporters in Woodridge, Ill. during the U.S. premiere of her new movie, 'National Lampoon's Pledge This!' Court documents in a lawsuit claiming she didn't adequately promote the movie 'Pledge This!' portray her as a globetrotting workaholic who earned $22 million over a two-year period from contracts ranging from pushing Motorola cell phones in Japan to metal alloys in Austria. [Agencies]

MIAMI – Paris Hilton may seem like the ultimate party girl, but she and her handlers swear she's really a globe-trotting workaholic who relentlessly plugs her projects and products.

Defending herself against a lawsuit claiming she didn't do enough to promote the 2006 bomb "Pledge This," Hilton insists in a deposition in Miami federal court that she went the extra mile for the movie.

"Any chance I got, any red carpet, any press, if I was doing something for another product ... I would just bring it up, 'Oh, my new sorority film, it's going to be sexy, it's going to be really hot girls' — like I really, you know, did my best," said Hilton, 28.

The deposition offers several other glimpses into Hilton's life, including her preference for David Letterman because Jay Leno asks questions she doesn't like. She also acknowledges she'd never seen her own cell phone bills until attorneys showed her one in an attempt to figure out who she was calling.

Asked who gets her bills, she replied, "I don't know. I'm assuming, like, whoever pays my bills. I never ask about that stuff."

In the movie, a National Lampoon vehicle billed as a raunchy college comedy, Hilton plays Victoria English, president of the exclusive Gamma Gamma Gamma Sorority at fictional South Beach University. She wants to win a major men's magazine's "America's Hottest Sorority" contest, but the rules say the winning chapter needs diversity. Misfits are recruited and hilarity ensues, although audiences apparently didn't think so. The movie only made it to 25 theaters and lost money.

The hotel heiress and her company, Paris Hilton Entertainment Inc., contend she honored her deal to promote the limited theatrical release of "Pledge This!" and never agreed to do as much for the DVD. They also contend the investors made unreasonable and last-minute demands for publicity events when her overflowing schedule was fully booked.

"She's the single busiest person on the planet," Hilton attorney Michael Weinstein said Tuesday at a hearing on pretrial motions.

In her March deposition, Hilton describes doing "a huge blowout" with press at the Cannes Film Festival in 2005 in hopes of drumming up interest.