Demi Lovato to replace Ariana Grande as All-Star concert headliner, sources confirm.

Ariana Grande has pulled out of the MLB All-Star Concert, sources confirm to FOX19 NOW.

At this time there is no confirmation of a replacement act for the concert Saturday night at Paul Brown Stadium.

The free concert sold out in a matter of minutes when tickets were made available. Gates for the scheduled concert open at 5 p.m. for the 8 p.m. concert.

Fireworks are scheduled for after the show.

It is not clear why Grande backed out. On Monday, she tweeted about a wisdom teeth operation.

"peace out, final three wisdom teeth. been real. (i feel like a**)," Grande posted to Twitter.

She is coming under fire on the Internet Wednesday after media reports quoted her saying "I HATE Americans. I hate America," in a donut shop video.

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