The Extra (2017) online

Bad boy movie star Derrick Stone books himself as an extra as a prank. When he arrives on set, no one recognizes him as Derrick Stone, they just think he looks like Derrick Stone. Finding new friends and a love interest in Mary, the wardrobe assistant, he begins living a double identity as Derrick and Joe, the extra. Events collide and comedy ensues as Derrick's stardom is put at risk, and Derrick is put to the test as Joe, begins to take over his life