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Mariah Carey always has someone around to make sure she’s looking beautiful — proven in these pictures … which show the rule applies even when she’s hitting a theme park.

The singer was at Universal Studios’ Islands of Adventure in Orlando Wednesday — where she was celebrating her twins Moroccan and Monroe‘s 13th birthday … and Mama Bear herself ended up getting on one of the rides, which sent her ‘do into a frenzy.

The photos are pretty freakin’ hilarious — you can see MC hanging on for dear life as she gets whipped around on the rollercoaster … and her long, luscious locks are flying high.

No harm, no foul of course — but Mariah wasn’t about to start walking around the park afterward and let her hair look like a damn mess … ’cause she had her assistant start brushing her mane as soon as they were back at ground zero and steady again after.

Mariah was totally into it too, flashing a big smile and waving to paps who were firing away.

We’ll give credit where credit is due … Mariah was clearly game to get on the ride and enjoy the good time with her kids — but hey, she’s an icon too … and needs to maintain her gorgeous appearance. An icon’s gotta do what an icon’s gotta do … eye-rollers be damned.

As for the festivities … it looks like Mariah and her ex, Nick Cannon, have been celebrating the twins’ birthdays for at least a couple of days now — and clearly, they go all out for them.

Based on what Mariah’s wearing in these pics — a customized birthday shirt for Moroccan and Monroe — you can tell they got all the love in the world for their children.

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You can call her a diva if you want, but at least she knows she’s fabulous. Get ’em, Mimi!