Hopefuls trying their luck will perform in front of producers and if they impress they'll sing for the judges later in the competition.
Returning host Dermot O'Leary who is in Cardiff for the auditions, said: "As always I'm looking forward to the laughs, the hugs, maybe not so much the tears, and watching really talented people... and some not-so-talented people.
"But that's the beauty of the show - you never know who's up next."
More top news
The first building has opened at Welsh history museum St Fagans as part of an ongoing multi-million pound redevelopment project.
Horeb surgery in Treorchy is closing because the health board has been unable to recruit a GP to keep it open.
The Labour leadership candidate was accused of misogyny for calling on Labour to 'smash' the prime minister 'back on her heels'