Kelly Clarkson needs to be there for her family.

The "Since U Been Gone" singer shared that she had to reschedule the remainder of her August Studio Sesson concerts at Las Vegas' Colosseum at Caesars Palace because her ex-husband Brandon Blackstock —with whom she shares kids River Rose , 11, and Remington "Remy" Alexander , 8—is suffering from an undisclosed illness.

"Unfortunately, I need to postpone the remainder of the August Studio Session dates in Las Vegas," Kelly wrote on Instagram Aug. 6. "While I normally keep my personal life private, this past year, my children's father has been ill and at this moment, I need to be fully present for them."

And while the 43-year-old didn't specify when the postponed shows will be rescheduled, Ticketmaster already has new dates in

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