Detroit Pistons star Malik Beasley‘s wife, Montana Yao, has filed for legal separation … one day before their fifth wedding anniversary, TMZ Sports has learned.

The 27-year-old model — who shares two kids with the NBA vet — filed the docs on Tuesday … citing “irreconcilable differences.”

Yao is seeking spousal support, according to court docs we obtained.

It’s not the first split for the two — as we previously reported, Yao filed for divorce back in December 2020 … weeks after Beasley was spotted holding hands with Larsa Pippen.

Yao previously admitted she was “blindsided” by the photos … and opened up on social media about the challenges her family faced at the time.

The two eventually patched things up and remained together for half a decade.

Yao gave birth to their first child, Makai, in March 2019 … and Mia was welcomed to the world in November 2022.

Beasley — a first-round pick in the 2016 NBA Draft — is having a solid year on the court despite the development off it — he’s averaging 16.6 points in 62 appearances this season for Motor City.

Yao was a staple at Beasley’s games … regularly attending his home and away contests in support.