Alec Baldwin posts 'astonishing' shirtless throwback alongside famous brothers: Photo!

The boys are back!

Alec Baldwin shared a never-before-seen throwback photo of himself hanging out with his famous brothers on Instagram on Thursday. In the old photo, the former "30 Rock" star and brothers Stephen, Daniel and Billy pose shirtless and flexing, showing off their buff bods.

"Gonna get the band back together..." Baldwin, now 60, captioned the post. 

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Gonna get the band back together...

A post shared by Alec Baldwin (@alecbaldwininsta) on

It's unclear when exactly the photo was taken, but the actor jokingly said that the photo was was taken during a "strip search in jail" when a fan asked where they were in the picture.

Daniel, now 58, also commented on the Instagram, writing, "[Throwin] it WAAAAY back with the boyz!!!! #barebackmountain."

20 PHOTOS
Alec Baldwin and Stephen Baldwin together through the years
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Alec Baldwin and Stephen Baldwin together through the years
NEW YORK, NY - NOVEMBER 23: Actors William Baldwin and Alec Baldwin attend The 204 Russian American Person Of The Year Awards at The National Arts Club on November 23, 2014 in New York City. (Photo by Stephen Lovekin/Getty Images)
HOLLYWOOD, CA - JUNE 08: (L-R) Actor Alec Baldwin, Hilaria Thomas and actors Tom Cruise and Stephen Baldwin arrive at the 'Rock of Ages' Los Angeles premiere held at Grauman's Chinese Theatre on June 8, 2012 in Hollywood, California. (Photo by Lester Cohen/WireImage)
NEW YORK, NY - MAY 23: Alec Baldwin and Stephen Baldwin attends the 2011 Actors Fund Gala at Marriot Marquis on May 23, 2011 in New York City. (Photo by T Roth/WireImage)
Actors Alec Baldwin and his brother Stephen Baldwin pose during Alec Baldwin's Hollywood Walk of Fame Induction Ceremony on February 14, 2011 in Hollywood, California. (Photo by Dr. Billy Ingram/WireImage)
HOLLYWOOD, CA - FEBRUARY 14: (L-R) Stephen Baldwin, Alec Baldwin and Megan Mullally attend the ceremony honoring actor Alec Baldwin with a Star on The Hollywood Walk of Fame held on February 14, 2011 in Hollywood, California. (Photo by Michael Tran/FilmMagic)
(L-R) Brothers Billy Baldwin, Stephen Baldwin, Alec Baldwin and Daniel Baldwin arrive at the U.S. Launch Event for New Lotus Cars held at a private residence on November 12, 2010 in Los Angeles, California.
- NOVEMBER 12: (L-R) Billy Baldwin, Stephen Baldwin, Alec Baldwin and Danny Baldwin attend U.S. Launch Event for Lotus New Era on November 12, 2010 at Los Angeles, California. (Photo by ANDREAS BRANCH/Patrick McMullan via Getty Images)
NEW YORK - DECEMBER 09: Actors Alec Baldwin and Stephen Baldwin attend the New York premiere of 'It's Complicated' at The Paris Theatre on December 9, 2009 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK CITY, NY - JUNE 15: Alec Baldwin and Stephen Baldwin attend The Tony Awards at Radio City Music Hall on June 15, 2008 in New York City. (Photo by JIMI CELESTE/Patrick McMullan via Getty Images)
Alec Baldwin and Stephen Baldwin during Second Stage Theatre's 20th Annual All-Star Bowling Classic at Leisure Time Bowling Lanes in New York City, New York, United States. (Photo by Bruce Glikas/FilmMagic)
Alec Baldwin and Stephen Baldwin (Photo by Stephen Lovekin/WireImage)
Alec Baldwin and Stephen Baldwin during Premiere of 'Freaky Friday' at El Capitan Theater in Hollywood, California, United States. (Photo by Albert L. Ortega/WireImage)
Stephen and Alec Baldwin arrive at the New York premiere of HBO's 'Sex and the City' at Lincoln Square Theatres in New York City. 05/30/2001. Photo: Evan Agostini/ImageDirect
UNITED STATES - MAY 30: Brothers Alec Baldwin and Stephen Baldwin are on hand for the New York season premiere of the TV series 'Sex and the City' at the Loews Cineplex Lincoln Square theater. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - SEPTEMBER 08: Celebrities abound at the 2002 U.S. Open men's finals match at Arthur Ashe Stadium in Flushing Meadows-Corona Park, Queens. Watching the action are (clockwise from upper left) Alec Baldwin with brother Stephen and Hilary Swank with husband Chad Lowe. (Photo by Howard Earl Simmons/NY Daily News Archive via Getty Images)
UNITED STATES - MAY 03: Baldwin family Billy, Beth, Alec, wife of Stephen and Stephen at the Carol M. Baldwin Cancer Research Fund Benefit Gala. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - NOVEMBER 09: Alec Baldwin with cigar and brother Stephen Baldwin attending Evander Holyfield and Michael Moorer fight at the All Star Cafe. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
UNITED STATES - circa 1995: (L-R) Actor brothers Stephen Baldwin, Alec Baldwin and William Baldwin. (Photo by The LIFE Picture Collection/Getty Images)
UNITED STATES: circa 1990: Actors and brothers (L-R) Alec Baldwin, Stephen Baldwin, William Baldwin and Daniel Baldwin. (Photo by The LIFE Picture Collection/Getty Images)
WEST HOLLYWOOD, CA - JUNE 29: Actor William Baldwin, actor Alec Baldwin and actor Stephen Baldwin attend the 'Great Balls of Fire!' West Hollywood Premiere on June 29, 1989 at the DGA Theatre in West Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
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Fans also loved the photo, writing, "All of u guys still sexy as always" and "love me some Baldwin boys!"

Others joked about the disparity in the amount of chest hair that the brothers have in the throwback: "Would you like your Baldwin with chest hair or without?" one person asked, while another posted, "My god. Can you imagine the amount of hair in the bathroom when they were teens?"

"The disparity in the amount of chest hair you each have is astonishing," another commenter wrote.

5 PHOTOS
Alec and Hilaria Baldwin rare red carpet outing with the kids
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Alec and Hilaria Baldwin rare red carpet outing with the kids
EAST HAMPTON, NY - OCTOBER 06: Bord of Directors Co-Chair Alec Baldwin (2nd L)Hailaria Baldwin (R) and their children attend the red carpet and Chairman's Reception at Suna Residence during Hamptons International Film Festival 2018 - Day Three on October 6, 2018 in East Hampton, New York. (Photo by Eugene Gologursky/Getty Images for Hamptons International Film Festival)
EAST HAMPTON, NY - OCTOBER 06: Bord of Directors Co-Chair Alec Baldwin (2nd L)Hailaria Baldwin (R) and their children attend the red carpet and Chairman's Reception at Suna Residence during Hamptons International Film Festival 2018 - Day Three on October 6, 2018 in East Hampton, New York. (Photo by Eugene Gologursky/Getty Images for Hamptons International Film Festival)
EAST HAMPTON, NY - OCTOBER 06: Bord of Directors Co-Chair Alec Baldwin (2nd L)Hailaria Baldwin (R) and their children attend the red carpet and Chairman's Reception at Suna Residence during Hamptons International Film Festival 2018 - Day Three on October 6, 2018 in East Hampton, New York. (Photo by Eugene Gologursky/Getty Images for Hamptons International Film Festival)
EAST HAMPTON, NY - OCTOBER 06: Bord of Directors Co-Chair Alec Baldwin (R) attends the red carpet and Chairman's Reception at Suna Residence during Hamptons International Film Festival 2018 - Day Three on October 6, 2018 in East Hampton, New York. (Photo by Eugene Gologursky/Getty Images for Hamptons International Film Festival)
EAST HAMPTON, NY - OCTOBER 06: Bord of Directors Co-Chair Alec Baldwin (2nd L)Hailaria Baldwin (R) and their children attend the red carpet and Chairman's Reception at Suna Residence during Hamptons International Film Festival 2018 - Day Three on October 6, 2018 in East Hampton, New York. (Photo by Eugene Gologursky/Getty Images for Hamptons International Film Festival)
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