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.
This report contains pictures from FremantleMedia / Syco and Vertigo Films
Dancing dog Pudsey and his handler Ashleigh are in Cardiff for the Welsh premiere of a new film about him tonight.
They first wowed the nation in the auditions for Britain's Got Talent here in the city in 2012, on their way to winning the ITV talent show.
BGT stars Ashleigh and Pudsey paid a quick visit to ITV Cymru Wales' new base in Cardiff Bay this afternoon, ahead of the Welsh premiere tonight of a new film starring the dog with all the tricks.
Here you can watch the tease we asked them to record for tonight's Wales at Six - and watch the programme on ITV at 6pm to see some more of Pudsey's tricks!
Britain's Got Talent winners Ashleigh and Pudsey are back in Cardiff tonight, for the Welsh premiere of the film about the talented trick-performing pooch.
They won the ITV talent show in 2012, after impressing the judges - and the public - from their first audition in Wales' capital.
Pudsey The Dog: The Movie is out in cinemas on Friday.
BGT judge David Walliams provides Pudsey's voice in the film.
The red carpet will be rolled out in Cardiff tonight as Ashleigh and Pudsey, who wowed audiences on ITV's Britain's Got Talent in 2012, come to town.
The talented pair are here in the capital to attend a screening of their new film Pudsey The Dog: The Movie.
Bars and Melody, featuring 13-year-old Leondre Devries from Port Talbot, have finished third in the final of Britain's Got Talent.
In Saturday night's final on ITV, Leondre and his friend Charlie Lenehan again performed the song 'Hope' by Twista ft Faith Evans, with Leondre rapping about bullying, which he experienced when he was younger.
Operatic boy band Collabro won Britain's Got Talent 2014 - with singer Lucy Kay second.
Bars and Melody are the latest Port Talbot act to star on the ITV talent show. Paul Potts won the first series in 2007, and young dancers Nu Sxool and Pre-Skool made the final the last two years.
ITV Wales filmed with Leondre - rapping, and speaking about his experiences of bullying - back in November 2012 - before he went on Britain's Got Talent.
Musical theatre boy band Collabro are the winners of Britain's Got Talent after they finishing ahead of opera singer Lucky Kay and young rap duo Bars and Melody in tonight's final.
Vocal harmony group Jack Pack finished fourth, illusionist Darcy Oake came fifth and 15-year-old singer James Smith was sixth.
Tomorrow night, it's the final of Britain's Got Talent Series 8 - and, once again, an act from Port Talbot is in the running for glory.
Leondre Devries, 13, is one half of rapping duo Bars and Melody, and the latest in a string of Port Talbot-born stars to make it big.
This report contains pictures from Syco / FremantleMedia
13-year-old rapper Leondre Devries from Port Talbot is one half of Bars and Melody - the favourites to win the final of Britain's Got Talent 2014.
Here you can watch him - before he was famous - rapping and speaking to ITV Wales back in November 2012:
He and his brother Joseph were launching a campaign to fight bullying - and Leondre told our Correspondent Carl Edwards: "I just want to use my words and power to target bullying and stop it - that's my target."
Leondre and his friend Charlie Lenehan, from Bristol, wowed the judges in their first audition on the ITV talent show this year, with Leondre rapping about his experiences of bullying, and earning a golden buzzer from Simon Cowell.
That performance has now been watched 30 million times on YouTube.
Bars and Melody member Leondre Devries, who is from Port Talbot, told ITV News the town is "a good environment" to grow up in, and praised it as a "friendly" place.
The pair will now compete in the final of this year's Britain's Got Talent after going through in last night's semi-final.
On Twitter, the duo thanked fans for their support.
"WE are so proud of you...thank you so much" they wrote.