Was Ashlee Simpson's song Boyfriend is about Lindsay Lohan?

During an appearance on Watch What Happens Live,  Ashlee Simpson was required to answer Andy Cohen’s Plead the Fifth questions.

On one question, Cohen asked, “In your 2005 song ‘Boyfriend,’ there were rumors that the lyrics ‘I didn’t steal your boyfriend,’ that that lyric was allegedly about you not stealing Wilmer Valderrama from Lindsay Lohan. Is that true, and how would you characterize your relationship with Lindsay?”.

Ashlee answered, "Yeah I mean, I hung out with him first and I was interest in him at that point".

Cohen responded, "So I didn't steal you boyfriend. That was about you not stealing him from Lindsay".

Ashlee said, "I didn't. I was done".