When Howard K. Stern goes to court on charges of providing drugs to an addicted Anna Nicole Smith — who died from an accidental overdose at 39 in 2007 — he will also come face-to-face with her friend Bobby Trendy.

“I will be sitting in the front row of the courtroom,” Bobby, 29 — who befriended the single mom when he decorated her L.A. home during The Anna Nicole Show in 2002 — tells OK!.

“[Howard] found that Anna was vulnerable,” he says. “I would ask Howard, ‘Why did you do this to Anna? I thought you were her friend.’ I miss Anna dearly. She changed my life.”

Along with doctors Sandeep Kapoor and Khristine Eroshevich, Howard, 40, faces up to five years and eight months in prison if convicted.