Kylie Jenner says she and her boyfriend Travis Scott are "broken and devastated", as she releases a statement via Instagram.
It comes after at least eight people died at the rapper's gig in Texas on Friday.
The youngest victims were 14 and 16, while 25 other people were taken to hospital in a serious condition.
Kylie, who's expecting their second child, says her "thoughts and prayers" are with all those affected.
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Meanwhile, a criminal investigation's underway, after reports also emerged of a security guard being injected in the neck with drugs.
Officials say they're not ruling anything out as to why so many people died - and the rapper says he'll work with authorities to find out what happened.
