Video footage shows Bobbi Kristina Brown, 19, inside the casino at the MGM Grand in Las Vegas, playing the slot machines with her boyfriend on Saturday night.
The casino is launching an internal investigation into the matter. The Nevada Gaming Commission has also started an investigation of their own.
Bobbi Kristina was in Vegas over the weekend to attend the Billboard Music Awards on Sunday.
Nevada takes underage gambling very seriously. Although a misdemeanor, the offense is punishable by up to 6 months in jail or a $1,000 fine.
The way celebrity justice works, Bobbi Kristina will likely get off with a warning, or probation at worst.
The casino could also be subject to a fine, albeit a lot more severe.