Justin Bieber and Floyd Mayweather

Justin Bieber has been a frequent guest of Floyd Mayweather Jr. at his fights and other events since 2012, when the Canadian pop star was just an impressionable 18-year-old. It could be they are both compatible being Pisces, with Mayweather's birthday on Feb. 24 and Biebs just days later on March 1. Here is a look back at the inseparable pair.

Justin Bieber and Floyd Mayweather

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Justin Bieber and Floyd Mayweather Jr. walk backstage during "An Evening with Justin Bieber" on Nov. 13, 2015 at Staples Center in Los Angeles.

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Justin Bieber and Floyd Mayweather Jr. walk onstage during "An Evening with Justin Bieber" on Nov. 13, 2015 at Staples Center in Los Angeles.

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Justin Bieber stands in the ring prior to Floyd Mayweather Jr.'s WBC/WBA welterweight title fight against Andre Berto on Sept. 12, 2015 at the MGM Grand Garden Arena in Las Vegas.

Justin Bieber poses with Floyd Mayweather Jr., CEO of Mayweather Productions Leonard Ellerbe, and Manny Pacquiao during the Floyd Mayweather vs. Manny Pacquiao Press Conference on March 11, 2015 at Nokia Theatre L.A. Live in Los Angeles.

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Justin Bieber poses with Floyd Mayweather Jr. during the Floyd Mayweather vs. Manny Pacquiao Press Conference on March 11, 2015 at Nokia Theatre L.A. Live in Los Angeles.

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Justin Bieber greets Floyd Mayweather Jr. as they attend Game Four of the Western Conference Semifinals between the Oklahoma City Thunder and the Los Angeles Clippers on May 11, 2014 at Staples Center in Los Angeles.

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Floyd Mayweather Jr. and Justin Bieber hug as they attend Game Four of the Western Conference Semifinals between the Oklahoma City Thunder and the Los Angeles Clippers on May 11, 2014 at Staples Center in Los Angeles.

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Floyd Mayweather Jr. is joined by Justin Bieber celebrate as he heads to the ring for his WBC/WBA welterweight unification fight against Marcos Maidana on May 3, 2014 at the MGM Grand Garden Arena in Las Vegas.

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Justin Bieber and Floyd Mayweather Jr. celebrate after Mayweather defeated Marcos Maidana by majority decision in their WBC/WBA welterweight unification fight on May 3, 2014 at the MGM Grand Garden Arena in Las Vegas.

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Floyd Mayweather Jr. enters the ring alongside Justin Bieber for his WBC/WBA 154-pound title fight against Saul 'El Canelo' Alvarez on Sept. 14, 2013 at the MGM Grand Garden Arena in Las Vegas.

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Floyd Mayweather Jr. and Justin Bieber pose together after Mayweather defeated Saul 'El Canelo' Alvarez by majority decision in their WBC/WBA 154-pound title fight on Sept. 14, 2013 at the MGM Grand Garden Arena in Las Vegas.

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Justin Bieber carries Floyd Mayweather Jr.'s title belts into the ring before Mayweather's WBA super welterweight title fight against Miguel Cotto on May 5, 2012 at the MGM Grand Garden Arena in Las Vegas.

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Justin Bieber holds up Floyd Mayweather Jr.'s title belts before Mayweather's WBA super welterweight title fight against Miguel Cotto on May 5, 2012 at the MGM Grand Garden Arena in Las Vegas.

Justin Bieber, Lil Wayne, Floyd Mayweather Jr. and Curtis '50 Cent' Jackson pose together after Mayweather defeated Miguel Cotto by unanimous decision in their WBA super welterweight title fight on May 5, 2012 at the MGM Grand Garden Arena in Las Vegas.

Justin Bieber and Floyd Mayweather Jr. pose together after Mayweather defeated Miguel Cotto by unanimous decision in their WBA super welterweight title fight on May 5, 2012 at the MGM Grand Garden Arena in Las Vegas.