There’s nothing like trying to get into the mind of a celebrity stalker. Mostly because – without exception – they’ve always lost their minds. Which is the only feasible explanation for why Simon Cowell’s ex-girlfriend, Terri Seymour, was attacked last night. A woman asked her if she was Cowell’s girlfriend, and then lunged at her and tried to choke her. Terri and Simon broke up in the fall, which begs the question: did crazy pants try to choke Terri because she’s no longer with Simon? Or because she was once with Simon? Is the crazy lady Simon’s stalker, or Terri’s? Should she be locked up forever and ever, or just for forever?

We’ve learned Terri Seymour — Simon Cowell’s ex — was assaulted after attending the “American Idol” finale last night.

It happened at L.A. Live — a complex that includes the Nokia Theatre where “A.I.” was taped. A 33-year-old woman walked up to Terri, asked if she was Simon’s girlfriend. The suspect allegedly attacked her and attempted to choke her.

The suspect — Janice Thibodeaux — was booked on felony battery. She’s being held on $52,700 bail.

We’re told Terri refused medical treatment. She was escorted out of the complex by three cops.

Just found out Thibodeaux is twice Terri’s size, weighing in at 200 lbs.

UPDATE — TMZ spoke with Thibodeaux’s brother and sister who told us Janice is “not crazy” and this is “way out of character” for her.

[From TMZ]

Thanks for that unbiased – and I’m sure medically accurate – diagnosis of your crazy sibling. Attacking someone who has not provoked you is crazy. If Thibodeaux’s brother and sister think she’s not crazy, then how exactly would they explain what happened? Ahh, yes, crazy’s the only explanation. Hopefully Thibodeaux won’t be able to make her bail. Stalker’s don’t ever give up on their own. They either get locked away, terrorize their victim and ruin their lives, or the worst-case scenario: they cause them physical harm. What I really don’t understand is a lot of stalkers are obsessed/in love with their victim. They don’t hate them. Yet they often try to physically assault them, which makes absolutely no sense. Though using sense is clearly a waste of time here.

Luckily it sounds like Terri’s fine, though I’m sure that was a traumatic experience. Hopefully this lady will remained locked up for a long, long time. Though considering the way the legal system deals with mentally ill offenders, I doubt it.

Here’s Terri Seymour at the Jenesse Silver Rose Gala & Auction in Beverly Hills on April 19th. Images thanks to WENN.com .