Inside Chrissy Teigen and Katie Cassidy's Twitter Feud Over Erin Andrews

— -- No one messes with Chrissy Teigen's friends. No one!

Before you read these tweets, here's what you need to know -- supermodel Chrissy Teigen and sportscaster Erin Andrews are best friends. Katie Cassidy is a star on "Arrow" opposite Stephen Amell.

Here's how the feud went down between Teigen and Cassidy:

During Sunday's Seattle Seahawks football game, Amell tweeted at Andrews while she was reporting on the sidelines. Here's what he said. Seems harmless enough.

To which Cassidy responded, "Seriously, why isn't she doing her job??"

Then, Teigen stepped in and decided to defend her friend.

"@MzKatieCassidy JOB [noun] : the work a person does regularly to make money. alt: what @ErinAndrews has. 2nd alt: What you don't have. Bye!" she wrote.

From that point, things just got totally out of hand!

Then:

Then:

Nope, not over.

Cassidy fit in her tweets somewhere along the way that she was not talking trash about Andrews, even though Teigen took it that way.

Someone tweeted "big misunderstanding?" to which Cassidy agreed and wrote, "thank you..."

As of last night, Cassidy had tweeted: "Just to be clear, Your profile reads:"Gold digger and Stuff". You're asking me if I have a job? I'll send you a book. @chrissyteigen."

It looks like Teigen has moved on to other matters after the small flare-up between her and the actress.