She's one of the most admired actresses in Hollywood, both for her talent and versatility.

But despite the hits on her resume — "Chicago" and the two "Bridget Jones" movies among others — and a 2004 Academy Award for "Cold Mountain," Renee Zellweger is also seen by those in the industry as an unreliable box-office draw. Indeed, the question often asked in Hollywood is, "Does Renee have what it takes to remain a star?"

After all, most superstar actresses are more aggressive in their pursuit of fame, are difficult to get along with, display more divalike demands, and have a prickly temperament to match. They can also get away with it because they're usually sexy, exciting and pull in the customers.