Anna is a Sagittarius, on the cusp of Scorpio. I think she finds it all very fascinating but doesn't invest a lot of energy into it. She's ten, after all. As an adult, I can see her reading her horoscope occasionally and getting her fortune told at a fair on a whim. And while I don't remember horoscopes coming up in her canon . . . fortune-telling, psychics, destiny, fate, prophecy, things written and foretold . . . yeah. They've been mentioned once or twice.

Meg is an Aquarius. Meg does not believe that this fact has any impact on her life. She'll listen if one of her roommates wants to read her her horoscope out of the paper, but because it's polite. Meg really doesn't believe in Fate, etc. She does, however, find it handy to have a zodiac sign when introducing an angel to a vampire.

Elle Woods is a Gemini, and includes this information when she introduces herself in canon. I think she reads her horoscope every day, and can see her having told her fortune told.