Offset turned the big 3-0 earlier this month, and last night he and Cardi turned things waaaay up by cutting her hubby a $2 mil check ... during a night filled with money-hurling, drinks and lots and lots of twerking.

As you see, hubby and wife let loose for the celebration. Offset was decked out in a Louis Vuitton blue jacket, and Cardi's chest glistened with a giant Playboy bunny chain. As you know, she was recently anointed the mag's creative director.

Now, she's looking to help her man diversify too ... Cardi says the $2 mil check for Offset is seed money for some big biz ventures he has coming up in 2022.

That's the trend in show biz these days ... significant others are pumping up loved ones' portfolios. Remember, Tiffany Haddish's wish list was real estate, and ditto for Cardi. Investments are the new Lambo!!!

But, back to the party ... Cardi and Offset weren't the only big names front and center ... Kanye, The Game, Takeoff, French and Quavo also pulled up to last night's event.

Ye came solo, in authentic Kanye fashion ... a purple hoodie, covering his face with a black baseball cap and sunglasses in the dead of night. He layered things up with an oversized leather coat, grey jeans and chunky-soled boots.