Megan Fox has joined the cast of Transformers director Michael Bay's new film.

The screen beauty found fame in the filmmaker's robot flick in 2007, but she left the franchise three years later.

Michael has now announced that the pair are reuniting for Teenage Mutant Ninja Turtles, which he is producing.

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He wrote on his website: "TMNT: we are bringing Megan Fox back into the family!"

According to The Hollywood Reporter's Heat Vision blog, Megan will play the female lead of April O'Neil in the live-action CG hybrid movie.

April is the human friend of the Ninja Turtles.