Kylie Jenner took the stand today to testify against Blac Chyna.

This week marks week two of the defamation trial.

Chyna filed a lawsuit against the ENTIRE Kar-Jenner family over five years ago.

Kylie took the stand to share her side of the Blac Chyna/Rob Kardashian/Tyga drama that unfolded years ago.

Kylie and Tyga began dating right after BC and the rapper called it quits.

During her testimony, Kylie said her ex-boyfriend showed her a scar left on his body that he sustained from BC.

She also recalled the concerns she had when her brother started dating the Lashed Cosmetics owner.

"I felt it was my duty to express my concerns, but ultimately it was up to him," Kylie told the judge.

Last week during Kris’ testimony, she alleged that Chyna threatened to kill Kylie.