Director Michael Bay thought she was too skinny

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Megan Fox had to put on weight for the new Transformers movie.

The actress says director Michael Bay wanted her full of energy for the action scenes.

‘I had to put on size for Transformers II because [director] Michael [Bay] doesn’t like skinny girls,’ she says.

‘I had three weeks to gain weight, and I put on 10lbs.’

The 22-year-old, who denies splitting from fiance Brian Austin Green, 35, says she managed to beef up by overindulging.

‘I had dinner at 10pm and ate cake at bedtime,’ she says.

But Megan is staying tight-lipped about the plot.

‘I can’t – I’ll get fired, and then they’ll replace me with Eva Longoria!’ she jokes.