When Arrow actress, Katie Cassidy questioned Erin Andrews' reporting skills during the Green Bay Packers vs. Seattle Seahawks Game, Erin's pal, Chrissy Teigen immediately rushed to defend her.

It all started when Katie's Arrow co-star Stephen Amell mentioned Erin in his tweet and said, "@ErinAndrews should ask Richard Sherman why he stayed on the field while he's a physical liability." To which Katie replied and tweeted, "Seriously, why isn't she doing her job?? @amellywood @BrandonStrabley @ErinAndrews"

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Chrissy, who is good friends with the sideline reporter, lodged herself into the Twitter conversation and posted a tweet in which she tagged Katie.

The tweet said, "@MzKatieCassidy JOB [noun] : the work a person does regularly to make money. alt: what @Erin Andrews has. 2nd alt: What you don't have. Bye!"

Erin surprisingly kept quiet throughout the conversation but the exchange of tweets between Katie and Chrissy just escalated from then on.

Katie, who probably saw Chrissy's tweet, replied with "@chrissyteigen @ErinAndrews and God Bless".

Chrissy then replied, "@MzKatieCassidy @ErinAndrews didn't sneeze but thank you".

Katie continued tweeting and said, "@chrissyteigen no, but God should bless her." Chrissy shot back with "@MzKatieCassidy oh so now we're being holy," which prompted Katie to reply with "@chrissyteigen we always have been. Welcome to the party!"

Katie's last tweet drove John Legend's wife to tell Katie that she "own it," and continued by telling her that she will take Katie seriously when she does not "simultaneously talk shit and preach the gospel."

The Twitter feud didn't stop there. Katie again called out Chrissy and tweeted, "I'm sorry u have negativity inside u. Can't be healthy. 2 be clear, not shit talking. But interesting u took it that way."

TagsKatie Cassidy, Chrissy Teigen, Erin Andrews, John Legend, Arrow