In 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.
In 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.