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Titillation: Megan Fox strikes a sexy pose in the bath on her Motorola smart phone during the Super Bowl advertIn Hollywood, it is commonplace for shy stars to enrol a body double for a sex scene.
But while Megan Fox happily went naked in her latest film Jennifer's Body, it appears she isn't quite so confident with her hands.
In her latest role, starring in a one-off Super Bowl advert for Motorola, it appears the actress has enlisted a hand double.
Scroll down to watch the advert
Hands on: Fox in Transformers: Revenge Of The Fallen last yearIn the Motorola ad screened yesterday, a naked Megan Fox reclines in a bubblebath with some strategically placed suds protecting her modesty.
But while her sexy pouting caught a lot of attention, other viewers were more concerned with the fact her 'hands' didn't belong to her.
In the commercial, a totally different woman's fingers are seen playing with the phone during the close-up.
The actress has a genetic condition called brachydactyly, which means she has clubbed thumbs.
So rather than use her actual thumbs for the close-up on the new Blur smart phone, Motorola enlisted a hand model.
While Motorola were likely expecting lots of internet buzz over Fox's naked appearance in the ad, bloggers couldn't help commending on her hands.
A writer on the Celebrity Smack blog said: 'Did anyone else catch this? I couldn’t help but chuckle when they showed a close-up of the Motorola phone and the hands holding it were definitely not Megan Fox’s.'
The 30 second ad, which would have cost Motorola between $2million and $3million for the coveted advertising slot, would have been seen by around 90million American TV viewers.
Spot the difference: The hand used in the Motorla ad (left) and a close-up of Fox's hand in How To Lose Friends And Influence PeopleThe ad sees the Transformers beauty lounging in a bath day-dreaming and wonders what would happen if she published a photo of herself on the internet.
After pouting for the camera in the bath, she says: 'I wonder what will happen if I send it out...'
The action then cuts to electrical wires exploding, a man falling off a ladder because his friend is preoccupied with the photo and arguing couples as they all receive the saucy photo.
The ad then returns to Fox in the bathtub, who muses: 'Probably nothing
Scrubs up well: Fox looks teasingly at the camera as she suggest sending her bathtime snaps all over the internet
Making love to the camera: Fox pouts for her close-upDespite suffering from the slight cosmetic defect, her short thumbs haven't stopped Fox from becoming one Hollywood's sexiest stars.
Leading New York hand surgeon Dr Steven Bendner told the New York Daily News last year: '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.
'You need it to be able to touch the other fingers and it is important for pinching," he says. "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.'
Chaos: Electrical cables explode as Fox's sizzling bath photograph works it way around the internet[endtext]