Kyle Massey Sues -- I Got Screwed Out of Bristol Palin's Reality Show

Former Disney star Kyle Massey claims he and his brother Christopher CREATED a reality TV show specifically for Bristol Palin ... only to get cut out of the project at the last minute ... this according to a new lawsuit.

In the suit, filed today in federal court in L.A., the Massey brothers claim they met Bristol on "Dancing with the Stars" ... and developed the idea for a show in which the brothers help Palin meet the challenges of child rearing while adjusting to life in L.A.

In fact, the Masseys claim they had even picked out a name for the show -- "Bristol-ogy 101."

But according to the suit, a producer named David McKenzie hijacked the project, cut the Masseys out of the show and repackaged the program as "Bristol Palin: Life's a Tripp" ... which is set to premiere tonight on Lifetime.

The Masseys are demanding a ton of money -- claiming they were guaranteed $500k to star in the show ... PLUS they want even more cash for coming up with the idea. The brothers also want a judge to shut down "Life's a Tripp" as soon possible.