Savannah Montgomery is a minor character on 90210, portrayed by Julianna Guill.
Savannah is Teddy's older sister and appears at the end of the Winter Wonderland dance when Teddy calls her upset because things with Silver were difficult. Silver sees her with Teddy and believes her to be another one of Teddy's conquests. She is last seen in "Girl Fight!" playing tennis with Teddy at the Beach club. Savannah and Teddy find Silver having lunch with Dixon, at which point Savannah is revealed as Teddy's sister.
She was mentioned by Teddy its reveal that she got married days after Teddy went to Vegas with his friends, In the next episode Teddy mentiones her again, that he was unvited to his sisters wedding because of his gay wedding video.