Victoria's Secret model Rosie Huntington-Whiteley (right) is the front-runner to replace Megan Fox as Shia LaBeouf's love interest in Transformers 3 -- but there are two other seriously hot options.

Transformers director Michael Bay is also considering Sports Illustrated model Brooklyn Decker (left) and actress Sarah Wright (center) for the role -- but according to Deadline, Bay's heart seems set on Huntington-Whiteley.

The studio began production on the project last week in L.A., but Bay has another week to make his final decision.

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