10/05/2011 06:19 pm ET | Updated Dec 05, 2011

James Marsden And Denise Richards To Guest Star On '30 Rock'

It looks like "30 Rock" is gearing up for quite a season.

It was just announced that Will Arnett will be returning as Jack's nemesis, Devon Banks. And now there are two more casting additions to the show, James Marsden and Denise Richards.

Things are certainly looking up for Marsden, who recently announced his separation from his wife, he has secured a multi-episode arc on the NBC hit, according to The Hollywood Reporter.

The nature of his role is hush-hush but, suffice it to say, with six episodes booked, we can expect that it'll be pretty major.

And then, just when you thought things were as good as they were going to get, Denise Richards joins in! Who expected that one? The beauty tweeted that she will be joining one of her favorite shows.

We can only guess how Liz Lemon will feel about this new lady.