EXCLUSIVE: Rande Gerber and George Clooney: Secrets behind Hollywood's ultimate bromance

EXCLUSIVE: Rande Gerber Spills Secrets on His Bromance With George Clooney

ET visited Cindy Crawford's husband, Rande Gerber, at his office in Malibu, California, and got the story behind the couple's close friendship with George Clooney and wife Amal.

At the crux of this relationship is Gerber's bond with Clooney, which started before either of the men were married to their current wives.

WATCH: George Clooney Was 'Forced' Into Starting Tequila Company

"George and I met probably over 20 years ago," Gerber shared with ET. "He was shooting a movie in New York. I owned a bar at the time and he was coming in and we just became friends. We'd have a couple of drinks, couple of tequilas. Actually we met over tequila."

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George Clooney through the years
UNITED STATES - MAY 02: ROSEANNE - 'Let's Call It Quits' - Season One - 5/2/89, Roseanne has difficulty accepting new rules from a tough new supervisor at the factory. George Clooney (Booker) stars., (Photo by ABC Photo Archives/ABC via Getty Images)
THE FACTS OF LIFE -- Pictured: George Clooney as George Burnett -- Photo by: Ron Tom/NBCU Photo Bank
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THE TONIGHT SHOW WITH JAY LENO -- Episode 1404 -- Pictured: (l-r) Actor George Clooney during an interview with host Jay Leno on June 25, 1998 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
NBC SUNDAY NIGHT AT THE MOVIES- COMBAT HIGH -- Pictured: (l-r) Keith Gordon as Max Mendelsson, George Clooney as Maj. Biff Woods -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
George Clooney and Julia Roberts during 11th Annual Critics' Choice Awards - Backstage and Audience at Santa Monica Civic Auditorium in Santa Monica, California, United States. (Photo by Chris Polk/FilmMagic)
George Clooney and Michelle Pfeiffer on phones in backseat of car in a scene from the film 'One Fine Day', 1996. (Photo by 20th Century-Fox/Getty Images)
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1999 George Clooney stars in the latest season of 'ER.'
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WESTWOOD, CA - DECEMBER 5: Actor George Clooney attends the 'Ocean's Eleven' Westwood Premiere on December 5, 2001 at the Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
George Clooney (Photo by Vera Anderson/WireImage)
US actor/movie maker George Clooney speaks during the global launch of 100 LIVES initiative and the announcement of a new humanitarian prize in New York on March 10, 2015. The 100 LIVES, initiated to express gratitude to individuals and institutions whose heroic actions saved Armenian lives during the Genocide 100 years ago, is to address the issues of genocide, human rights violations and the power of positive action. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
HOLLYWOOD - MARCH 31: Actor/director George Clooney arrives to the premiere of Universal Pictures' 'Leatherheads' held at Grauman's Chinese Theatre on March 31, 2008 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
BERLIN, GERMANY - FEBRUARY 8: (L to R) Actors Natascha McElhone, Ulrich Tukur, George Clooney and director Steven Soderbergh attend the 53rd Berlinale Film Festival February 8, 2003 in Berlin, Germany. Their new film 'Solaris' was written and directed by Soderbergh. (Photo by Kurt Vinion/Getty Images)
David Strathairn and George Clooney during 2005 Venice Film Festival - George Clooney - Sighting in Venice Lido, Italy. (Photo by George Pimentel/WireImage)
US actor and director George Clooney (R) and co-star Renee Zellweger arrive in London's Leicester Square on April 8, 2008 to attend the European Premiere of the film, Leatherheads directed by Clooney. AFP PHOTO / Max Nash (Photo credit should read MAX NASH/AFP/Getty Images)
LOS ANGELES - NOVEMBER 14: Actor George Clooney speaks to the media at the Four Seasons Hotel on November 14, 2006 in Los Angeles, California. (Photo by Piyal Hosain/Fotos International/Getty Images)
Nominee for Best Actor ('Michael Clayton') George Clooney (R) and gilrfriend Sarah Larson arrive for the 80th Annual Academy Awards at the Kodak Theater in Hollywood, California on February 24, 2008. AFP PHOTO / STAN HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
Actor George Clooney speaks during the 80th Annual Academy Awards held at the Kodak Theatre on February 24, 2008 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
Matt Damon and George Clooney (Photo by Lester Cohen Archive/WireImage)
George Clooney at junket for 'Good Night and Good Luck,' a new movie. (Photo by Michael Albans/NY Daily News Archive via Getty Images)

Meeting over tequila is meaningful, as they now own their own tequila company -- Casamigos. The drink debuted on the U.S. market in 2013, but started out as a private passion project between Clooney and Gerber. The two friends were on a mission to create the perfect tequila -- and after two years developing it and then two additional years drinking it, they were informed they had been ordering 1,000 bottles of Casamigos a year.

According to Gerber, he and Clooney were told they had to get licensed and "get legit" in order to keep producing the tequila.

WATCH: George Clooney Takes Amal Home to Kentucky, Hangs With the Locals

"They said... either you're selling it or you're drinking too much," Gerber explained.

Turning their passion into a business hasn't diminished their love of the product they created, and in fact helps them in the decision-making process.

"If we find that we're disagreeing on something, we'll usually have a drink," Gerber said, "and another and another and at the end, we've agreed somehow."

Casamigos (loosely translated "House of Friends") is named after the property in Mexico that Gerber and Clooney share.

Clooney is frequently snapped rocking the brand's logo; Cindy and Amal are also fans.

"He's giving it as gifts and he's bringing it to restaurants just in case they might not have it," Gerber said.

WATCH: George Clooney Photobombs Cindy Crawford and Rande Gerber in Ibiza

ET has a glimpse into their friendship and lifestyle away from the glamour of Hollywood through never-before-seen footage of Clooney and Gerber on their trip to Jalisco, Mexico last year.

In the clips, it's clear that they're not just friends, but also road trip buddies.

"We just get on the [motorcycles] and we go," Gerber said.

Watch the video above.

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