Adele dropped '23' -- and you didn't even know it!

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'The Oscars': Musical Moments: Adele- 'Skyfall'

While fans continue to buy up every copy of 25, her first album in four years since the release of 21, they may be surprised to learn that Adele had already kinda, sorta dropped 23.

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.

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"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.

PHOTOS: Adele through the years

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Adele through the years
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Adele dropped '23' -- and you didn't even know it!
COLOGNE, GERMANY - DECEMBER 06: Adele attends the television show 2015! Menschen, Bilder, Emotionen - RTL Jahresrueckblick on December 6, 2015 in Cologne, Germany. (Photo by Sascha Steinbach/Getty Images)
MAIDSTONE, UNITED KINGDOM - MAY 11: Adele performs on the Main Stage on the second day of the Radio 1 Big Weekend at Mote Park on May 11, 2008 in Maidstone, England. (Photo by Rosie Greenway/Getty Images)
LONDON - SEPTEMBER 09: Singer Adele arrives at the Mercury Music Prize 2008 at Grosvenor House Hotel on September 9, 2008 in London, England. (Photo by Chris Jackson/Getty Images)
WASHINGTON - JANUARY 17: Musician Adele performs at the 9:30 Club on January 17, 2009 in Washington, DC. (Photo by Michael Loccisano/Getty Images)
NEW YORK - NOVEMBER 13: Adele attends the Keep a Child Alive organization's 5th annual Black Ball at The Hammerstein Ballroom on November 13, 2008 in New York City. (Photo by Rob Loud/Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Singer Adele arrives at the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Larry Busacca/Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Singer Adele, winner of two awards; Best Female Pop Vocal Performance for 'Chasing Pavements' and Best New Artist, poses in the press room during the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
NEW YORK - SEPTEMBER 17: Adele performs onstage during 2009 VH1 Divas at Brooklyn Academy of Music on September 17, 2009 in New York City. (Photo by Christopher Polk/Getty Images)
LOS ANGELES, CA - AUGUST 28: Singer Adele arrives at the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - AUGUST 28: Singer Adele performs onstage during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
LOS ANGELES, CA - FEBRUARY 12: Singer Adele arrives at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - FEBRUARY 12: Singer Adele performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
Musician Adele poses with her six trophies at the 54th Grammy Awards in Los Angeles, California, February 12, 2012. AFP PHOTO/ FREDERIC J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
Singer Adele poses in the press room with her best original song in a motion picture award for 'Skyfall' at the Golden Globes awards ceremony in Beverly Hills on January 13, 2013. AFP PHOTO/Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
LOS ANGELES, CA - FEBRUARY 10: Singer Adele speaks onstage at the 55th Annual GRAMMY Awards at Staples Center on February 10, 2013 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Singer Adele, winner of the Best Original Song award for 'Skyfall,' poses in the press room during the Oscars held at Loews Hollywood Hotel on February 24, 2013 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Singer Adele arrives at the Oscars at Hollywood & Highland Center on February 24, 2013 in Hollywood, California. (Photo by Jason Merritt/Getty Images)
HOLLYWOOD, CA - FEBRUARY 24: Singer Adele performs onstage during the Oscars held at the Dolby Theatre on February 24, 2013 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
NEW YORK, NY - NOVEMBER 16: Adele is seen on November 16, 2015 in New York City. (Photo by Gardiner Anderson/Bauer-Griffin/GC Images)
NEW YORK, NY - NOVEMBER 20: Singer Adele is seen in Soho on November 20, 2015 in New York City. (Photo by Raymond Hall/GC Images)
SATURDAY NIGHT LIVE -- 'Matthew McConaughey' Episode 1689 -- Pictured: Musical guest Adele performs on November 21, 2015 -- (Photo by: Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0373 -- Pictured: (l-r) Singer Adele plays 'Box of Lies' with host Jimmy Fallon on November 23, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0374 -- Pictured: (l-r) Host Jimmy Fallon and The Roots sing with Adele during the Music Room bit on November 24, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 24: Adele is seen on November 24, 2015 in New York City. (Photo by Gardiner Anderson/Bauer-Griffin/GC Images)
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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.

NEWS: Adele Says Motherhood Changed 'Everything'

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.

The NBC special also features performances of several new songs, including the mega-hit, "Hello," and her latest single, "When We Were Young," which she says is her favorite that she's ever written.

Adele: Live in New York City airs Monday, Dec. 14 at 10 p.m. on NBC.

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