Tann Gella was a Rutian Twi'lek and twin sister to Ann Gella who served as slaves of the renowned podracer Sebulba. The pair escorted Sebulba in the years surrounding 32 BBY, after being bought from the Hutts. As Sebulba's yobanas, they had the unfortunate task of delivering a pre- and post-race massage to their Dug podracing owner.
Also, she was an acquaintance of Hutt crime lord Jabba Desilijic Tiure along with her sister, and was one of Jabba's guests during the death match between the Hutt's champion and Jedi Master Qui-Gon Jinn, the latter of whom was lured to Jabba's arena by her sister on behalf of Jabba, who was hoping for "worthy entertainment" from the Jedi Master.