Sophia Bush won’t let anyone speak badly about “sister” and co-star, Hilarie Burton.

Bush took to Twitter to defend Burton after the actress revealed she will not be attending an upcoming “One Tree Hill” event.

“I’m sorry, Mary,” she wrote to a fan. “I will not be attending any Eyecon events. Ever.”

RELATED: Sophia Bush & Hilarie Burton Speak Out After ‘One Tree Hill’ Creator Mark Schwahn Is Fired From ‘The Royals’

The upcoming Eyecon event in question allows fans to celebrate the beloved world of “One Tree Hill”. Many of the cast members return to South Carolina, along with die hard fans, where it all started.

Burton added, “I personally feel exploited by their ‘girl power’ angle, which exists at the expense of some of us who went through a difficult time on that show. They’re using our sisterhood as a sales gimmick. No thanks.”

After some backlash, Bush quickly came to her former co-star’s defense, “Hilarie Burton is my sister. Don’t f**k with her. Period,” she wrote along with a lengthy supportive message.

RELATED: Sophia Bush Elaborates On Why She Left ‘Chicago PD’

Bush revealed she too will not attend the upcoming event.

Burton also responded to the love from Bush.

Burton starred as Peyton Sawyer on the hit teen drama next to Bush’s Brooke Davis.

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