The 24-year-old songstress wore a "Team Bomba" T-shirt and tight black pants, reported E! Online.
Lovato pumped up the crowd and celebrated Bomba's win with a kiss, a source confirmed.
She then had a conversation with MMA superstar Randy Couture and his girlfriend, actress Mindy Robinson.
Lovato told them, "Everything's good! I'm excited!"
She addded that this wasn't the first time she was watching Bomba fight but it was her first time as his girlfriend, the source said.
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