Megan Fox and Machine Gun Kelly are going back to work on the Puerto Rican movie set where they first met … and set in motion her split from Brian Austin Green.

Megan and MGK arrived Thursday in San Juan after flying in together from the mainland, ready to get back to business on the set of their upcoming movie, “Midnight in the Switchgrass.”

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As you can see, Megan and MGK are still super close and lovey-dovey as their relationship continues to bud … and now they’re back where it all began.

They met during filming, way back in March, and then started spending a whole lotta time together when the coronavirus pandemic brought production to a grinding halt.

Megan split from her ‘90210’ star hubby after getting chummy with MGK on the Caribbean island and they’ve been pretty much inseparable ever since … going on fancy dates, making music videos, traveling the country, sleeping over and having fun in Palm Springs.

MGK and Megan are putting a 2020 twist on the old adage … couples who work together, play together and quarantine together, apparently stay together.