X Factor stars JLS are headlining a Welsh music festival - the Big Weekend at Ynysangharad Park in Pontypridd.
JB, Marvin, Aston and Oritse will take to the stage on Saturday 24 July for the third year of the festival that's put on by the Welsh government.
JLS have been topping the charts since they were runners up to Alexandra Burke on The X Factor in 2008.
They've had two number ones with Beat Again and Everybody in Love, and they won two Brit awards in February 2010.
The boys won two Brits in January
The rest of the line-up for Ponty's Big Weekend will be revealed in the next few weeks.
Tickets for the Saturday night concert with JLS go on sale on Thursday, and there's a free family day on the Sunday.