Gwen Stefani revealed a rather bizarre fact about her partner Blake Shelton’s ex-girlfriend when the No Doubt singer appeared on Wednesday’s “Jimmy Kimmel Live!”

The 48-year-old, who recently announced her very first Las Vegas residency, was asked by the talk show host about any musical crossovers that she and Shelton, 41, might have.

The singer revealed that she’d been a huge fan of the band Madness when she was younger, but she and Shelton do both like “cool rock, ’70s love songs.”

Stefani then admitted, “[Blake] did tell me that he dated a girl for like three months that had my face plastered over her whole bedroom. So, that’s kind of weird, right?”

RELATED: Blake Shelton Admits He ‘Thinks About’ Marrying Gwen Stefani

The musician’s appearance on the show also saw her talk up her upcoming Vegas dates, saying it’s going to be quite the show.

“Even when you are on tour and you go through Vegas, it’s quite a challenging show because you’re competing so much with just Vegas. So many choices and so much pressure people put on themselves to have the greatest time of their lives.”

RELATED: Gwen Stefani Sings Along To Blake Shelton’s Performance During ACMs

The “Hollaback Girl” star later took on a superfan in a rapid-fire game of “Who knows Gwen Stefani?”

It turns out Stefani isn’t as clued up on herself as some other people out there — for example, Diane. The pair answered questions such as, “Where was Gwen’s first paying job?” and “What was the first album Gwen ever purchased?”

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