Adam Levine tells fans he ate cake alone on his birthday, says it might have been 'the best' one ever

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The Candid Confessions of Adam Levine!

Adam Levine is comfortable being on his own.

The handsome Voice coach turned 37 years old on Friday, and celebrated the occasion by eating cake by himself. Though despite how it sounds, the experience was far from depressing.

"For my birthday yesterday, I sat in bed all day with the shades drawn eating this cake completely alone," Levine captioned an Instagram pic on Saturday of the delicious creation. "It might have been the best birthday I've ever had. I took time to reflect on so much and had a moment to genuinely appreciate the life that I have and the incredible people I have in it. I highly recommend taking at least one birthday in your life and keeping it to yourself. It f**kin RULED. And that cake was GOOD."

WATCH: Adam Levine and Behati Prinsloo Are Expecting Their First Child

It's definitely an exciting time for Levine, given that he and his wife, Victoria's Secret Angel Behati Prinsloo, are expecting their first child together. The 26-year-old supermodel is more than three months along, a source confirmed to ET earlier this month.

Levine and Prinsloo through the years:

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Adam Levine tells fans he ate cake alone on his birthday, says it might have been 'the best' one ever
INDIO, CA - APRIL 10: Musician Adam Levine (L) and model Behati Prinsloo attend day 1 of the 2015 Coachella Valley Music & Arts Festival (Weekend 1) at the Empire Polo Club on April 10, 2015 in Indio, California. (Photo by Christopher Polk/Getty Images for Coachella)
LAS VEGAS, NV - DECEMBER 02: (L-R) Model Chrissy Teigen, singer Katharine McPhee, model Behati Prinsloo, singer John Legend and singer Adam Levine attend 'Sinatra 100: An All-Star GRAMMY Concert' celebrating the late Frank Sinatra's 100th birthday at the Encore Theater at Wynn Las Vegas on December 2, 2015 in Las Vegas, Nevada. The show will air on CBS on December 6. (Photo by Lester Cohen/WireImage)
LAS VEGAS, NV - DECEMBER 02: Adam Levine and Behati Prinsloo pose backstage during 'Sinatra 100: An All-Star GRAMMY Concert' celebrating the late Frank Sinatra's 100th birthday at the Encore Theater at Wynn Las Vegas on December 2, 2015 in Las Vegas, Nevada. The show will air on CBS on December 6. (Photo by Kevin Mazur/WireImage)
BEVERLY HILLS, CA - FEBRUARY 22: Model Behati Prinsloo and musician Adam Levine arrive at the 2015 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 22, 2015 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 22: Behati Prinsloo and Adam Levine arrives at the 87th Annual Academy Awards at Hollywood & Highland Center on February 22, 2015 in Hollywood, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - JANUARY 11: Singer Adam Levine and model Behati Prinsloo attend the 72nd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 11, 2015 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - NOVEMBER 23: Singer/Songwriter Adam Levine and Behati Prinsloo attend the NBA game between the Denver Nuggets and the Los Angeles Lakers at Staples Center on November 23, 2014 in Los Angeles, California. (Photo by Victor Decolongon/Getty Images)
LOS ANGELES, CA - NOVEMBER 23: Adam Levine (R) and Behati Prinsloo attend a basketball game between the Denver Nuggets and the Los Angeles Lakers at Staples Center on November 23, 2014 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
LOS ANGELES, CA - OCTOBER 28: Adam Levine (L) and Behati Prinsloo attend a basketball game between the Houston Rockets and the Los Angeles Lakers at Staples Center on October 28, 2014 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
NEW YORK NY - SEPTEMBER 05: Adam Levine and Behati Prinsloo sighting on September 05, 2014 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
NEW YORK, NY - SEPTEMBER 03: Behati Prinsloo (L) and Adam Levine attend the launch party for Herring & Herring: Framed magazine at Lovers Of Today on September 3, 2014 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK, NY - JUNE 25: Adam Levine (R) and Model Behati Prinsloo attend the 'Begin Again' premiere at SVA Theater on June 25, 2014 in New York City. (Photo by Mike Pont/FilmMagic)
WEST HOLLYWOOD, CA - MARCH 02: Musician Adam Levine of Maroon 5 and Model Behati Prinsloo arrive to the 2014 Vanity Fair Oscar Party on March 2, 2014 in West Hollywood, California. (Photo by C Flanigan/WireImage)
LOS ANGELES, CA- AUGUST 25: Singer Adam Levine (R) and model Behati Prinsloo arrive at the 66th Annual Primetime Emmy Awards at Nokia Theatre L.A. Live on August 25, 2014 in Los Angeles, California.(Photo by Jeffrey Mayer/WireImage)
NEW YORK, NY - OCTOBER 24: Adam Levine and Behati Prinsloo attend the 2012 GQ Gentlemen's Ball presented by LG, Movado, and Nautica on October 24, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images for GQ,)
IMAGE DISTRIBUTED FOR THE TELEVISION ACADEMY - Behati Prinsloo, left, and Adam Levine arrive at the 66th Primetime Emmy Awards at the Nokia Theatre L.A. Live on Monday, Aug. 25, 2014, in Los Angeles. (Photo by Evan Agostini/Invision for the Television Academy/AP Images)
EXCLUSIVE - Adam Levine, left, and Behati Prinsloo pose backstage in the green room at the 66th Primetime Emmy Awards at the Nokia Theatre L.A. Live on Monday, Aug. 25, 2014, in Los Angeles. (Photo by Danny Moloshok/Invision for the Television Academy/AP Images)
Behati Prinsloo, left, and Adam Levine arrive at the 66th Annual Primetime Emmy Awards at the Nokia Theatre L.A. Live on Monday, Aug. 25, 2014, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)
Adam Levine and Behati Prinsloo arrive at the MTV Video Music Awards at The Forum on Sunday, Aug. 24, 2014, in Inglewood, Calif. (Photo by Jordan Strauss/Invision/AP)
Adam Levine and fiancee Behati Prinsloo attend the premiere of "Begin Again" at the SVA Theatre on Wednesday, June 25, 2014 in New York. (Photo by Evan Agostini/Invision/AP)
FILE - Adam Levine, left, and Behati Prinsloo attend the 2014 Vanity Fair Oscar Party, in this Sunday, March 2, 2014 file photo taken in West Hollywood, Calif. Maroon 5 frontman-turned designer Adam Levine said Levine in an interview Thursday April 17, 2014 his lack of fashion training is not a problem. Levine’s Victoria's Secret model fiancé Behati Prinsloo (bay-AHT'-ee PRINS'-lo) lent him a hand. He looked through Prinsloo’s closet for inspiration and the couple collaborated on a few pieces. (Photo by Evan Agostini/Invision/AP, File)
INGLEWOOD, CA - AUGUST 24: Recording artist Adam Levine (R) and model Behati Prinsloo attend the 2014 MTV Video Music Awards at The Forum on August 24, 2014 in Inglewood, California. (Photo by Jeff Kravitz/MTV1415/FilmMagic)
NEW YORK, NY - APRIL 26: Musician Adam Levine (L) and model Behati Prinsloo attend the CHANEL Dinner in honor of the 2014 Tribeca Film Festival closing night film 'Begin Again' at Tribeca Grill on April 26, 2014 in New York City. (Photo by Bryan Bedder/Getty Images for CHANEL)
WEST HOLLYWOOD, CA - MARCH 02: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Behati Prinsloo and Adam Levine attend the 2014 Vanity Fair Oscar Party Hosted By Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by Kevin Mazur/VF14/WireImage)
WEST HOLLYWOOD, CA - MARCH 02: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) (L-R) Model Behati Prinsloo, musician Adam Levine, actresses Lauren Miller, and Leslie Mann attend the 2014 Vanity Fair Oscar Party Viewing Dinner Hosted By Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by Larry Busacca/VF14/WireImage)
LOS ANGELES, CA - JANUARY 27: (L-R) Model Behati Prinsloo and recording artist Adam Levine of Maroon 5 attend 'The Night That Changed America: A GRAMMY Salute To The Beatles' at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Larry Busacca/Getty Images for NARAS)
LOS ANGELES, CA - JANUARY 27: (L-R) Recording artist John Legend, model Christine Teigen, model Behati Prinsloo and recording artist Adam Levine of Maroon 5 attend 'The Night That Changed America: A GRAMMY Salute To The Beatles' at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Larry Busacca/Getty Images for NARAS)
NEW YORK, NY - NOVEMBER 15: (EXCLUSIVE COVERAGE) Behati Prinsloo and Adam Levine are seen in the West Village on November 15, 2013 in New York City. (Photo by Alo Ceballos/FilmMagic)
NEW YORK, NY - NOVEMBER 15: (EXCLUSIVE COVERAGE) Behati Prinsloo and Adam Levine are seen in the West Village on November 15, 2013 in New York City. (Photo by Alo Ceballos/FilmMagic)
NEW YORK, NY - OCTOBER 24: Adam Levine and Behati Prinsloo attend the 2012 GQ Gentlemen's Ball presented by LG, Movado, and Nautica on October 24, 2012 in New York City.(Photo by Dimitrios Kambouris/Getty Images for GQ,)
NEW YORK, NY - OCTOBER 24: Behati Prinsloo, Adam Levine, Ted Danson and Kate Danson attend the 2012 GQ Gentlemen's Ball presented by LG, Movado, and Nautica on October 24, 2012 in New York City. (Photo by Dimitrios Kambouris/Getty Images for GQ,)
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Prinsloo recently took to Instagram to give a sweet birthday shout-out to her man, calling him the "love of her life." The two have been married since July 2014.

"Happy birthday to the love of my life!" Prinsloo captioned a pic of Levine giving her a piggyback ride. "Everything is boring and meaningless without you!!! #besthusband"

Happy birthday to the love of my life! Everything is boring and meaningless without you!!! 💋 #besthusband 🙇🏻

A photo posted by Behati Prinsloo Levine (@behatiprinsloo) on

WATCH: Adam Levine Shows Off Massive Back Tattoo That Took Six Months to Finish

ET caught up with Prinsloo earlier this month, when she dished on their matching wedding tattoos.

"It's on my side," she exclusively told ET about her meaningful ink, which reads "you're so cool, you're so cool, you're so cool" in script. "It's not a new thing. We first got it together when we got married."

Watch below:

Behati Prinsloo Explains Adam Levine's Massive Back Tattoo


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