It's about to be a HOT GIRL SUMMER for Megan Thee Stallion . . . this time for real. Her boyfriend Moneybagg Yo was caught cheating on her yesterday.

And the woman who he was attempting to cheat with just exposed him on Instagram . . . and ummm...she tagged Megan.

The woman is a beautiful Instagram model and she claims that she was minding her business, when Megan's boyfriend came and slid up into her dms - and left her a heart emoji.

And of course, the woman provided receipts for her allegations,

Look:

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Megan and Moneybagg Yo have been dating now for almost 6 months. Moneybagg, who has seven children with four different women, has been showering Megan with gifts for the past couple of months. 

Up until yesterday, Megan and Moneybagg were "exclusively" seeing each other. But given Moneybagg's attempt at infidelity . . . we're pretty sure that Megan is going to start LIVING THE LIFE SHE RAPS ABOUT IN HER SONGS!!

Megan and Moneybagg made their relationship public about a week ago - on Instagram. Thee Stallion confirmed that she is in a relationship with Moneybagg Yo. The pair have been rumored to be dating for the past several weeks, but this is the first time that either of them is confirming the rumors. Now he is having a severe case of the ex with a female issuing a stern warning to both of them.

Megan posted a pic of her new bae, calling him a 'Hot Boy'. And Moneybagg did the same on his own page.