During the BBC interview, Whittaker spoke about her love for the 1990s boy band, who she didn't know were also present in the studio, reports metro.co.uk.
The band performed "I'll Be The One" song for the "Doctor Who" star on air.
While the boys were singing, Whittaker became nostlagic and said: "BSB were the 'soundtrack of my youth', So my GCSEs, which is kind of our exams, that was the soundtrack for mine and my best friend's youth. It still gets rocked out every time we're together."
Whittaker's first episode of "Doctor Who" aired last Sunday and became the biggest season opener for the show in a decade with 8.2 million tuning in.
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