Though Showtime's long-running sex dramedy hit 'Californication' won't return until January 2014, Showtime has already made some serious castings for the potentially final season. In addition to the recently announced guest turn from 'The Sopranos' star Michael Imperioli, today Showtime has revealed that 'The Hangover Part 3' star Heather Graham and '24's' Mary Lynn Rajskub will take similarly meaty roles in 'Californication's' next cycle, but as who?

'Californication's' Hank Moody (David Duchovny) has come across some beautiful and famous women in his day, but the two latest additions to season 7 could be the loveliest yet. Via Deadline, we've learned that Heather Graham will take a season-long role, in addition to a guest appearance from '24's' Mary Lynn Rajskub.

Graham, next to be seen in reprising her role in 'The Hangover' trilogy's conclusion, will play a woman from Hank's past whose arrival "upends his life," while Rajskub will appear in a three-episode guest arc as a neurotic writer. Both stars join 'The Sopranos' vet Michael Imperioli, previously announced to take the role of TV producer Rick Rath, who plays a “key role” in Hank Moody’s latest business venture.

It remains to be seen if 'Californication' season 7 will prove to be the last year, given Showtime had earlier pondered a spinoff with Maggie Grace's character 'Faith,' but what say you? Are you excited to see what Heather Graham and Mary Lynn Rajskub bring to 'Californication' season 7?

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