Tamar Braxton is done with her marriage ... she's filed to divorce Vincent Herbert ... TMZ has learned.
Tamar filed divorce docs Tuesday in L.A. County. She and Vincent have been married for nearly 9 years -- they're one month shy of their anniversary. Tamar and the record exec have one child together -- their 4-year-old son, Logan Vincent.
It's the end of a long relationship -- Tamar and Vincent started dating in 2003. Her sister, Toni Braxton, had been working with him and introduced them.
Tamar's rep tells TMZ the singer made an "extremely difficult decision" in filing for divorce. The rep adds, "Collectively, their son Logan and his well being during this very unfortunate process is most important.
Some speculate that once Tamar was fired from "The Real" it wreaked havoc on her marriage.
Sources close to Tamar tell TMZ ... the singer's marriage to estranged hubby Vince Herbert suffered an irreparable fracture after going through a time of depression stemming from her firing in May.
But she was recently on the Wendy Williams show saying how she was working on her marriage: