Claire Danes was a vampire, sent to drain her neighbors’ sanity.

The Emmy-winning actor appeared on the “Late Show with Stephen Colbert” Wednesday and shared a story about how she used to be a “nightmare neighbor” until a ’90s icon who lived in her building eventually called her out — in a very funny way.

Screenshot “The Late Show with Stephen Colbert” via YouTube

“I had this really wonderful loft, it was like my bachelorette pad,” the “Homeland” star said about the New York City apartment she lived in during her 20s. “And I was dating a musician, and he had gifted me a drum set for a birthday or something.”

“The best possible neighbor,” Colbert remarked sarcastically.

“And, um, who was my downstairs neighbor but Billy Corgan from the Smashing Pumpkins,” she shared.

After cringing to herself, Danes continued.

“And he would meet me in the elevator, and be like, ‘Yeah, good progress, Claire. Great stuff.’”

“Do you still play?” Colbert asked.

“Um, no, I don’t think I ever played again! Uh, yeah, yeah, yeah, yeah. Oh gosh,” Danes said.

Funnily enough, Angela Chase — Danes’ breakout role in the short-lived teen drama “My So-Called Life” — tells her dad at the tail end of Episode 4 that Smashing Pumpkins is one of her favorite bands.

Little did Danes know that a few years later, the band’s frontman would suggest she’s terrible at playing the drums.

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“I was 14 when I did the bulk of [‘My So-Called Life’],” Danes told Colbert earlier in her interview Wednesday, noting she filmed the pilot when she was just 13. “But [I was] a baby, but I felt very mature at the time.”

“I have an almost 13-year-old child now,” Danes continued. “And I look at him, and I’m like, ‘No, no, no, I was definitely not close to an adult person.’”