"In Touch" says that Hudson will drop by the small screen series as a personal favor to her close friend, Sara Foster, who will soon join the show as Annalynne McCord (Naomi)'s insane older sister. Apparently Foster and Hudson have always wanted to work together and because Hudson adored the original "90210" as a kid, she decided to do this.
The network tells me the tale above is totally untrue and Kate's representation denies it as well.
So yeah, I'm going to go ahead and believe them on this one. For now.
Anyway, the show's got Donna Martin back, that's all I need. You guys happy with D's homecoming?