During her concert special at Radio City Music Hall in New York City, which will air on Monday, Dec. 14 on NBC, the singer revealed that "Skyfall" actually filled the void between albums.
"I was 23 at the time," Adele says, adding that since Skyfall was the 23rd James Bond film, it made sense for her to write and record the titular theme song that earned her an Oscar for Best Original Song.
The now 27-year-old also reveals she was pregnant with her son, Angelo, when she recorded the track -- changing the register in her voice. "My voice was really low," she says, admitting it's hard for her to perform the song live. Her son was later born on Oct. 19, 2012, just two weeks after the song was officially released.
In fact, the special was only the third time she ever sang "Skyfall" live following a performance at the 85th Academy Awards in 2013 ("That was a laugh," she jokes about the ceremony) and another during a BBC concert special that aired this past November.
Adele: Live in New York City airs Monday, Dec. 14 at 10 p.m. on NBC.