Diddy 's twin daughters found themselves in a little trouble at the fair recently -- 'cause they got booted from a rollercoaster ... and, it was all caught on video.

Jessie and D'Lila Combs -- Diddy's 18-year-old twins -- were spotted at the Orange County Fair in Southern California on Saturday around 9 PM ... they were sitting on a rollercoaster waiting to take off. TMZ.com

Check out the clip ... a worker is speaking to the group -- the Combs twins in matching pink sweatsuits with some pals -- and, it seems he tells them to take a hike.

The group ultimately walks away and nothing seems to come of it ... but, we're told this all took place 'cause Jessie and D'Lila were told to put their phones away by staff three times -- and, they wouldn't listen. Getty

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