AnnaLynne McCord was feeling blue on set yesterday ... literally.
The sexy "90210" star was spotted wearing a Na'vi costume from "Avatar" on Monday in Westwood, CA -- tail and all!
The actress was even seen making out with a geeky looking guy during the shoot -- and according to JustJared.com, AnnaLynne's character, Naomi, dons the crazy getup to impress a sci-fi fan she meets on the internet.
Check out all the wild pics -- the new season of "90210" starts back up again on January 24.
