Ariana Grande and Pete Davidson upped the happiness factor even more after their speedy engagement by heading to the Happiest Place on Earth ... Disneyland!!

The singer and 'SNL' cast member caught everyone by surprise Monday with the news they are getting hitched, especially since they've only been dating for a little over a month. Both were still linked to their previous significant others as recently as last month.

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Hours later, after the engagement news broke, they were cruising on Big Thunder Mountain Railroad at Disneyland. They were having a blast and holding tight onto each other's hands, and Ariana posted several videos of Davidson screaming his head off on the ride.