The actress revealed her 2004 song Over was all about Valderrama during a taped appearance on The Ellen DeGeneres Show, where her decade-old performance on the programme was replayed, and she revealed she wrote the song the day after the actor broke her heart.
Lohan recalls, "It's a very emotional song. I'd just broken up with someone... It was Wilmer. I was really upset and that song, I'd written, like, the day after, and we were still living together.
"I sang it at his house - to torture him. I was recording the song so loud in his house.
"I was filming (movie) Herbie (Fully Loaded) at the same time; there was a lot going on."
Lohan's appearance on The Ellen DeGeneres Show airs in America on Monday afternoon (31Mar14).