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Mercedes "MJ" Javid says the sun has gone down on her union to Tommy Feight ... 'cause the "Shahs of Sunset" star has filed for divorce after more than seven years of marriage.

The reality star filed the documents in Los Angeles Friday night ... and, she lists the date of separation as last Friday, October 17 -- so, it seems she didn't wait long to head over to the courthouse after the split. Getty

She's citing the boilerplate irreconcilable differences as the reason for the split ... and, she's asking to block the court's ability to award spousal support to herself or her estranged husband.

Mercedes and Tommy married on April 21, 2018, and they share a 6-year-old child together named Shams , and MJ is asking for sole physical and legal custody ... but is open to a visit

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