Both made the trip to Dublin for Katie Taylor’s homecoming fight against undisputed super-lightweight champion Chantelle Cameron.
And as Brook was being interviewed by Matchroom, Benn walked behind him.
And before long, Brook turned his attention to Benn causing a coming together between the two.
They went nose-to-nose before simultaneously pushing each other, sparking a brief shoving match.
Security were forced to intervene as the pair began exchanging words with tempers flaring.
Benn, 26, is currently fighting to prove his innocence following a failed drug test before his proposed catchweight bout with Chris Eubank Jr, 33, in October.
He failed Voluntary Anti-Doping Association tests but an investigation from the WBC found “no conclusive evidence” of deliberate cheating.
But the British Board of Boxing Control and United Kingdom Anti-Doping were at loggerheads with Benn.
The welterweight is not currently licensed by the BBBoC and faced moving his career abroad in order to return.
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But Benn appears willing now to work with UKAD with the evidence he feels will prove his innocence.
Meanwhile Brook, 37, retired after beating arch rival Amir Khan, 36, in March 2022.
But he has continued to tease a comeback since and has held talks with promoter Eddie Hearn.
A leaked sparring session of the former IBF champion and Benn fuelled rumours of a potential all-British bout.
And their ringside fracas at the 3Arena has only intensified the possibility.