Although Megan Fox was seen reclining in a bubble bath in her new Super Bowl ad, a hand double was used for close-up shots of her playing with Motorola’s new Blur smart phone.

The model was brought in because Megan has a genetic condition called brachydactyly, which means she has clubbed thumbs. (You can see some pictures of her hands here.)

Despite drafting in a replacement pair of hands for the advert, experts have previously said Megan’s problem is not serious.

“Literally, what it means is short finger. The nail of the thumb in this condition is often very short and wide. It is usually hereditary,” leading New York hand surgeon Dr. Steven Bendner said last year.

“You need it to be able to touch the other fingers and it is important for pinching. In Megan Fox’s case, it appears that only the last bone of the thumb is affected and that it does not involve the joint. For her, it looks like it’s just a cosmetic deficit,” Bendner added.