'Weeds': Alanis Morisette, Jennifer Jason Leigh returning in Season 6

weeds-jennifer-jason-leigh-alanis-morissette.jpg "Weeds" is welcoming back two of its Season 5 guest stars -- Alanis Morisette and Jennifer Jason Leigh, Showtime confirms to Zap2it.

If you'll remember, Alanis was Nancy's baby doctor and Andy's girlfriend Audra Kitson, while Jennifer Jason Leigh was Nancy's sister Jill (who coincidentally also slept with Justin Kirk's Andy Botwin).

Both will return in Season 6, Morissette for two episodes and Leigh for one. Mark-Paul Gosselaar was also recently announced in a one-episode guest-starring role as a love interest for Nancy. "Weeds" returns for its sixth season on Monday, August 16, at 10 p.m. on Showtime. To whet your "Weeds" whistle, check out this trailer for Season 6 -- Mary-Louise Parker looks uber-hot burying Nancy's secrets.

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Photo credit: Showtime