"Weeds" is well into its latest season and soon to be joining the cast is Michelle Trachtenberg, who will guest-star on two episodes.

Trachtenberg will appear in the episodes Une Mère Que J'aimerais Baiser, System Overhead and  Synthetics. The actress, whose TV credits include "Gossip Girl," "Love Bites," "Mercy," and "Buffy the Vampire Slayer," will play a sexy, pot-dealing rival to Mary-Louise Parker's character, Nancy.

Trachtenberg also made an appearance on "Gossip Girl" in its final episode, which can only mean we will see more of her fiery character, Georgina Sparks in the new season this fall.

"Weeds" premieres Monday at 10 PM on Showtime.