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(TMZ) - Britney Spears just dumped her boyfriend of 18 months ... after finding out there's a video of him cheating on her that's being shopped around Hollywood, reports TMZ.

TMZ reports David Lucado is seen in the video making out with a woman and dancing with her. It looks like they're in someone's living room. According to TMZ, the video was shot in early August. 

TMZ called Lucado and a rep tells them, "David is very, very in love with Britney. This is unfortunate and he hopes that it all works out."

Well, it didn't. TMZ also contacted Britney's camp for comment, and they were told her father Jamie wanted to say something about it, but wanted to tell Britney first. It appears as soon he told her ... she broke up with David.

She tweeted:

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