Taylor Swift once again proved her late-night ratings power with a visit to The Late Show with Stephen Colbert last week.
Swift’s interview on December 10 didn’t just lift The Late Show—it delivered Colbert his strongest 18–49 demo performance since his post–Super Bowl episode in January, and the show’s fourth-largest total-viewer audience of the year.
In all, 3.2 million viewers tuned in for Swift’s first in-studio sit-down with Colbert—up 30% week-over-week, according to Nielsen Live+3 data.
The show’s only episodes to draw larger audiences in 2025 were driven by outsized events: Late Show‘s post–Super Bowl broadcast on January 26 (3.6 million viewers), the July 21 episode following Colbert’s on-air announcement that his show had been canceled (3.4 million), and the September 18 show featuring Colbert’s response to Jimmy Kimmel’s suspension (3.3 million).
Among younger viewers, the Swift Effect was even more pronounced, surging 45% week-over-week to 378,000 viewers. Those gains were enough to give Colbert late night’s largest audience of the night in both total viewers and adults 18–49.
The message is becoming increasingly clear: a Taylor Swift booking isn’t just a get—it’s a ratings event, capable of rivaling episodes driven by sports lead-ins, network upheaval, and breaking news.
Colbert now joins NBC’s Jimmy Fallon and Seth Meyers, both of whom saw similarly outsized lifts following Swift’s October visits. As we’ve reported, Swift’s October 6 appearance on The Tonight Show Starring Jimmy Fallon produced the show’s strongest regular-episode performance of the year, while Late Night with Seth Meyers delivered its best 18–49 showing since January two nights later.
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