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Give Miley Cyrus her flowers ... because she just reportedly got engaged to Maxx Morando !!!

Maxx's father reportedly let the cat out of the bag when he posted a series of photos from Miley's 33rd birthday ... including one snap where you see a ring on that finger ... and PEOPLE just confirmed the engagement.

In the caption for his post, Maxx's dad congratulated Miley and his son ... and he even added emojis showing a bottle of champagne and a ring. Getty

The couple was quick to celebrate the relationship milestone as they hit the world premiere for "Avatar: Fire and Ash" Monday night in Hollywood. Getty

Miley was wearing the same ring from the photos Maxx's dad posted, and made no effort to hide it as she posed with her fiancé. Getty

Miley and Maxx

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