The former Strictly Come Dancing judge made his debut on the ITV show this year and has had a big impact - getting the Golden Buzzer rules wrong, twice, and swearing on live TV during the semi-finals.
As hosts Ant McPartlin and Declan Donnelly welcomed viewers to the Hammersmith Apollo for the 2023 grand final on Sunday 4 June at 7.30pm it sounded like there was booing from the crowd, alongside cheers, when the 67-year-old Italian TV star was being introduced.
TV viewers at home noticed, commenting on Twitter.
Another questioned: "Is it my hearing or does it sound like the audience keep booing bruno on bgt tonight? #BritainsGotTalent"
One viewer asked: "Why are the audience booing Bruno? Is he just not liked? #BGT"
Another wrote: "Has Bruno done something wrong that I don’t know about?? Why does the crowd keep booing him??? #BGT #BritainsGotTalent #BGT2023"
And another shared: "Is it just me or are the audience booing bruno tonight? #bgt"
Many viewers were surprised to hear booing at the start of the light entertainment show.
One tweeted: "So much booing? Am I hearing right?! #BGT"
And another said: "Why are the audience booing #BGT."
But a spokesperson for Thames TV said people in the theatre were chanting "Bruno", which may have been mistaken for the sound of boos.
There were a few heckles from the crowd during the evening, with head judge Simon Cowell also booed when he told 11-year-old Olivia Lynes that she sounded nervous at the start of her performance of Let It Go from Frozen.
Watch: Bruno Tonioli does not know the rules to BGT admits fellow judge Alesha Dixon