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The 205-pound title fight will headline the event, which takes place at Compuware Arena in Plymouth Township, Michigan, and airs on Spike TV.
Newton (23-7-1) is coming off a five-round split decision win against Attila Vegh in a title unification bout in March. The California-based champion is riding a five-fight win streak, which includes two wins over Muhammed Lawal.
"I've been wanting to get back in the cage as soon as possible," Newton said. "Beltran is a guy that always pushes the pace and looks for a finish, which plays into my style perfectly."
Beltran (15-10) is 1-1 since signing with Bellator late last year. He suffered a first-round TKO loss to Quinton Jackson in his debut in November, but rebounded with a submission victory over Vladimir Matyushenko.
A former heavyweight, Beltran is 2-3 since dropping a weight class in 2012. He was released by the UFC last year, following a split decision loss to Fabio Maldonado in October.
Bellator MMA light heavyweight champion Emanuel Newton will seek his first title defense against former UFC veteran Joey Beltran at Bellator 124 on Sept. 12.