The Ghost Whisperer Guest Star Alert: Alexa Vega and Gail O'Grady

On next week's all-new episode of The Ghost Whisperer, "Endless Love," a pair of solid actresses guest star on the CBS drama.

Look for young Alexa Vega (best known for her role in Spy Kids) to guest star as Serena Westen, a girl that would like to get vampires to leave her alone.

Gail O'Grady (picured, from NYPD Blue and American Dreams) will play her mother.