Megan Thee Stallion was front and center, cheering on her beau, Klay Thompson, for his NBA season-opener when he and his Mavs got blown out by over 30 points -- and she's doubling down her affection in a new single!!!
On Friday, Megan unleashed her "Lover Girl" single -- independently released on her Hot Girl Productions imprint -- lyrically gushing over Klay's moves off the court ... "My man, my man, my man, my baby, my baby / D****n' me down, spoiling me, driving me crazy.