Fergie: Crystal Meth 'Hardest Boyfriend'
But, as she admits in the new issue of Time, feeling high in the past meant using crystal meth.
"It was the hardest boyfriend I ever had to break up with," she says. "I dug deep as to why I got there. It's the drug that's addicting. But it's why you start doing it in the first place that's interesting. A lot of it was being a child actor; I learned to suppress feelings."
These days, performing is her outlet for those feelings. "We're on tour," she says. "I have an hour and a half of performing every night and improvising. If there's a rafter, I can climb right on."
And while her nickname comes from her family – "My grandpa's Fergie. My dad's Ferg. And I'm Junior," she says – she's familiar with that "other" Fergie, Britain's Duchess of York. "She called me on the phone," says the Southern California-born singer (real name: Stacy Ferguson). "We're talking about doing some charity work together, building schools."