Bobbi Kristina Brown, 19, was apparently caught on video at a slot machine in the MGM Grand Resort and Casino with her boyfriend Nick Gordon, 23, the Daily Star reported.
The legal age for gambling in Nevada is 21.
The MGM Grand launched an internal investigation after celebrity news site TMZ.com posted the footage.
The Nevada Gaming Control Board is also investigating and its chairman Mark Lipparelli said they were also looking into whether casino employees let her gamble.
MGM Resorts spokesman Gordon Absher said the company would “co-operate fully with the Gaming Control Board”.
Underage gambling is an offence in Nevada, punishable by up to six months in jail or a fine.
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