Supernatural, Grey's bolster casts

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Supergirl wasn't the only role being filled by a young hottie over the past few days; three other easy-on-the-eyes actresses joined television shows as they prepare their upcoming seasons, according to The Hollywood Reporter.

Joining the cast of CW's Supernatural next season will be Katie Cassidy. The actress will come on board as Ruby, a demon hunter who befriends the duo of Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles).

Showbiz is in Cassidy's blood, as she is the daughter of musician David Cassidy. The 20-year-old stunner guest starred on 7th Heaven as Zoe, and was featured in a pair of slashers, Black Christmas and When a Stranger Calls.

After appearing in the season three finale of Grey's Anatomy, actress Chyler Leigh will return as a regular character on the medical drama. Leigh plays Lexie Grey, the half-sister of main character Meredith Grey. Leigh has bounced around a few television shows such as The Practice, That '80s Show, and Reunion, but may be most recognized for her role as Janey Briggs, the loser-turned-prom-queen in the spoof Not Another Teen Movie.

Finally, Grey's spin-off Private Practice will welcome KaDee Strickland (The Wedding Bells) to its cast. She will play a hospital administrator named Charlotte.

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