The 44-year-old Fleiss tells KVVU-TV she was at the house in Pahrump, west of Last Vegas, when the fire broke out, but was unharmed.
KVVU-TV reports the fire started in a chimney that lacked a "spark arrestor," a device that prevents sparks from escaping the fireplace.
Fire officials couldn't immediately be reached for comment.
It's unclear how much damage the house sustained, but a video released by celebrity website TMZ shows flames flowing from the roof.
Fleiss once ran a high-priced Los Angeles prostitution ring providing models-turned-prostitutes to wealthy clients. She moved to Pahrump in late 2005, several years after serving 21 months in a California prison for money laundering, tax evasion and attempted pandering.