THIS is the shocking moment a gender reveal party descended into chaos as huge flames erupted.

Horror footage shows the mum-to-be spark a massive blaze as she set off a coloured flare beside naked flames.

The clip shows the excited woman spraying a blue flare up into the air as joyful guests – holding foot-long flames – celebrate.

But within seconds, a massive blaze engulfs the room as a wooden structure above the party catches alight.

Panicked partygoers can be heard screaming as others laugh – with many continuing to brandish their hand-held flames amid the mayhem.

One guest can then be seen frantically trying to extinguish the raging fire by throwing liquid up towards the glaring flames from a green bottle.

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Others take note of his quick-thinking action and join in, attempting to calm the flames by squirting drinks up into the air from bottles.

It's unclear how long it took for the blaze to be put out.

But viewers of the dramatic clip have taken to Reddit to share their disbelief.

One commented: "People celebrate shit in the weirdest way.

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"I would never even have thought to light the ceiling on fire in such a festive way."

Another said: "Why do they still look happy when the roof is literally on fire?"

A third replied: "They did this INSIDE A BUILDING?"

Another user responded: "Love how everybody just stands there and a guy squeezes a water bottle."

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Meanwhile, another gender reveal bash was ruined when a woman's cat burst all of the coloured balloons before her guests arrived.

And another couple terrified their neighbour's dog after using fireworks for their party.

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