Now that her tenure as Head Villainess-In-Charge on MTV’s The Hills is going up in smoke, Kristin Cavallari is amped to write a “tell-all” about her Hills cohorts.

Wait — Kristin Cavallari can write?!

“After The Hills, I plan to work on many business opportunities, and I have always wanted to write a tell-all book,” the aspiring actress blabbed to In Touch Magazine.

She’s begun the book, and according to an insider with knowledge, she’ll dish on her love life and that of her famous pals.