Megan Thee Stallion is officially in her NBA WAG era ... the rapper made her courtside debut at the Mavericks' preseason finale in Las Vegas on Wednesday to support her boyfriend, Klay Thompson.
The "Bigger In Texas" spitter was spotted at T-Mobile Arena for Dallas' exhibition tilt vs. the Lakers ... and she had one of the best seats in the house to catch her man do his thing on the hardwood.
Fans were excited to see Meg supporting Klay, including ESPN's like Kendrick Perkins, who applauded the Mavericks star while live on air for getting a girl like her.