Superstar Mariah, who arrived without husband Nick Cannon, rocked a black bodycon dress and strappy white heels at the event on Wednesday night (23 July).
Draped in accessories, the 44-year-old beamed as she posed for photographers while sporting a huge smile.
We know Mariah loves to take a good photo, and she proved just that, as she sneaked in a couple of selfies as she was travelling to the premiere!
Making use of the natural light, the 'We Belong Together' singer told fans: "Magic hour photography...#nofilter loving the light."
It turns out Mariah was pretty impressed with the movie too, which sees WWE star Dwayne Johnson - aka The Rock - take the lead as Hercules.
She tweeted last night: "A+++mazing movie!!!!!"
After the screening, mum-of-two Mariah headed to the after party, where she rubbed shoulders with more A-listers, including Dwayne and her long-time director friend Brett Ratner.
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Watch Mariah's video for 'You're Mine (Eternal)' below: