Who is Megan replacement in Transformers 3?

There wasn't a direct replacement for Megan Fox in Transformers 3. While she was replaced in the franchise after the second movie, *Transformers: Revenge of the Fallen*, the third movie, *Transformers: Dark of the Moon*, introduced a new female lead, Rosie Huntington-Whiteley.

It's important to note that there was some controversy surrounding Megan Fox's departure. She publicly criticized the director Michael Bay, and was ultimately replaced.