Ashlee Simpson Reveals 'Boyfriend' Was About Lindsay Lohan -- Talks Jessica's Split From Nick Lachey
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Ashlee Simpson has a LOT to say about Lindsay Lohan, Britney Spears, Mandy Moore, Christina Aguilera, P!nk and sister Jessica on "Watch What Happens Live."

Ashlee Simpson is finally coming clean about her 2005 hit, "Boyfriend," in which she repeatedly says she "didn't steal your boyfriend."

On Tuesday's "Watch What Happens Live," host Andy Cohen grilled the pop-turned-reality star about her relationship with early 2000s frenemy Lindsay Lohan.

When Andy asked Ashlee if there was any truth to the rumors that "Boyfriend" was about her not stealing Wilmer Valderrama from LiLo, Ashlee fessed up -- as did her husband, Evan Ross.

"Yeah, I mean, I hung out with him at first, and I wasn't interested in him at that point," Ashlee said. "So, yeah. And we're great! All is well. And by the way, they're the best. All the love! I was done. But all love here!"

To clarify Andy's question, Evan added, "So, it was. It was."

But Ashlee was not always so forthcoming about the truth behind the track. At the time, she denied whispers that the song was about Lindsay and Wilmer, telling MTV, "It's not about one person in particular. It's just something every girl can relate to. It's a song about [how] every girl out there sometimes thinks you stole her boyfriend. It's just making fun of that."

In a later interview with Ryan Seacrest on "Larry King Now," the singer explained, "It's very junior high, high school, college and whatnot -- the situation. And it's me kind of making fun of something I went through. As far as saying who I wrote it about, or whatever, I'm not doing that with this record."

On Tuesday's "WWHL," Ashlee also opened up about a variety of other hot-button topics, including the split between sister Jessica Simpson and 98 Degrees singer Nick Lachey.

"On a scale from zero to 10, how surprised were you by the split of Nick Lachey and your sister?" Andy asked. Ashlee grinned and said, "A five."

Andy then asked Ashlee to rate fellow 2000s pop stars Britney Spears, Mandy Moore, Christina Aguilera and P!nk from most talented to least talented.

Ashlee said Christina was the most talented, followed by P!nk, then said Britney and Mandy were tied "for different reasons."

"Mandy's a great actress, and Britney's a great performer," she said.

Regarding her catastrophic "Saturday Night Live" performance back in 2004, Ashlee said she was the one responsible for the technical malfunction.

"Me," she said. "Me completely. What happened there was I had a vocal problem. I had two nodes beating against each other, and I woke up, and I had no voice. And I should have said, 'No, I will not go on. I will not do this.'"

Andy then asked Ashlee if she'd perform on the "SNL" stage again, to which she replied, "I did do it again, which nobody talks about! 'Oh, that happened? You went back on? We don't care.'"

Ashlee added that, at the time, the experience greatly affected her. "I was such a young girl, and it was heavy," she said. "But for me, it made me stronger. Shit happens."

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