"Gossip" is very commonly used, as is "dish" (sometimes "dish the dirt", but usually just "dish.") Tittle-tattle is extremely outdated. By the way, "dish" can be used as a noun and a verb.
Mary:"I just heard the juiciest piece of gossip about the boss!"
Sue: "Really? Well, don't keep it to yourself - dish!!"
Mary: "I found out that when she went on vacation last month, she was really in the hospital getting a face lift!"
Julia: "Have you heard the latest dish about that guy that lives in the house on the corner?"
Suzanne: "No, what's up?"
Julia: "I found out that he's being sued by two of his ex-wives for not paying alimony."