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Two months after launching their relationship, Megan Thee Stallion and Klay Thompson are once again stepping out in public ... this time at a star-studded Jay-Z event!

TMZ Sports has learned Klay, 35, and Meg, 30, plan to hit up Hov and billionaire Michael Rubin 's REFORM Alliance Casino Gala at the Ocean City Resort in Atlantic City on Saturday, one of their few public cameos together.

Of course, the future Hall of Famer first got people talking about him and Meg on July 12 ... when he posted a pic kissing a woman whose back was to the camera. Fans speculated it was the rapper. Instagram / @klaythompson

Then, just a few days later, on July 15, Klay and Meg hit up NYC hot spot Carbone together, where they walked hand-in-hand.

It was no summer fling, e

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