We caught up with all of the judges, plus Ant and Dec, as they arrived to begin their talent-search. The girls both recognised our reporter!
Morgan Westcott, a member of Only Boys Aloud, has spoken to ITV Wales about his experiences of cyber-bullying.
The teenage male voice choir sang the Welsh hymn Calon Lân, while fellow Welsh act Nu Sxool also won praise for their performance.
Yay! Its BGT day! Cannot wait!!I'm not gonna lie to you! My tummy is churning with excitement!!!!#showuswhatyougotwales
It's day 1 of Britain's Got Talent auditions - the red carpet is being rolled out and the sun is shining! http://t.co/fNaLwYAg
Wales is the first stop for this year's Britain's Got Talent judge's auditions tour, with two days of auditions at the Wales Millennium Centre.
Welsh teenage male voice choir Only Boys Aloud did the nation proud last year coming in third in the competition and Simon Cowell, Alesha Dixon, Amanda Holden and David Walliams are back in the capital looking for more Welsh talent.
The auditions tour will visit Birmingham, Manchester, Glasgow and London, but Cardiff takes centre stage hosting auditions today and tomorrow.
The 140-strong choir, Only Boys Aloud, made it to third place in this year's Britain's Got Talent final.
Their team captain, David Mahoney, and two members from the choir, Dan Hampton and Tom Touhig joined Andrea Byrne and Jonathan Hill on the ITV Wales sofa to talk about celebrations, Olympic Games and the future of the group.
Teenage male voice choir Only Boys Aloud came third in the Britain's Got Talent final on Saturday night. After impressing audiences and judges alike, they're now considering what to do next - as Rob Osborne reports.
Talkback Thames/Syco pictures
So the day's arrived. It's a beautiful morning in London & we have the small matter of the BRITAIN'S GOT TALENT FINAL TONIGHT!!! #voteoba
Two great welsh acts on BGT tonite doing Wales proud.OnlyBoysAloud & Nu Skool. Only Boys allowed get my vote though as I love them singing
There are just twenty four hours of preparation left for the two Welsh acts in the final of ITV's Britain's Got Talent tomorrow night.
Only Boys Aloud were keeping tight lipped on what we can expect from them tomorrow as they put their finishing touches to their performance.
Both dance group Nu Sxool and choir Only Boys Aloud both say they think they can win!
Members of the Port Talbot-based dance troupe Nu Sxool talk to ITV Wales about their hopes for Saturday's 'Britain's Got Talent' final.