The 50-year-old actress said she was furious when she spotted a message from Elisa on his phone asking to practice his English but soon realised it was just an app he was using to improve his English.
"One day there was a message on his phone that said, 'Hi, if you want to improve your English why don't we practice now.' It was a very sexy voice and I thought, 'What the hell? Who is this Elisa coming after my husband.' But then I thought, 'No, let it go.'
Hayek and Pinault tied the knot in 2009 and are parents to daughter Valentina Paloma Pinault.