Emmy Preview: Who Should Expect a Nomination?

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Ahead of the Emmy nominations announcement tomorrow morning, LA Times TV critic Mary McNamara gave ET the lowdown on this year's most promising contenders.

As more movie stars have looked to TV as a creative outlet, Julianne Moore, Nicole Kidman, Clive Owen and Kevin Costner are likely to be the biggest names among the nominees.

Moore transformed into Sarah Palin for the HBO movie Game Change, while Kidman played writer Martha Gellhorn alongside Owen (portraying Ernest Hemingway) for HBO's Hemingway & Gellhorn. In keeping with the trend, Costner played a historical character from the Civil War days. The two-time Oscar winner embodied "Devil Anse" Hatfield for the History Channel mini series Hatfields & McCoys.

RELATED: Julianne: Game Change Humanizes Sarah Palin

The AMC family could have a bit of sibling rivalry in house as their flagship show Mad Men is expected to have some stiff competition from the critically acclaimed drug drama Breaking Bad.

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"This week, [Breaking Bad] had their highest debut ever with like a 2.9 [rating]," McNamara noted.

Perhaps the most interesting race to watch will be the categories concerning actresses in a comedy. This past year brought talented newcomers to the category, including Zooey Deschanel and Lena Dunham.

The 64th Primetime Emmy Awards, hosted by Jimmy Kimmel, air September 23 on ABC.