The star shot to fame when he was cast as Neville Longbottom in the wizarding franchise, and appeared in all eight of the big screen blockbusters.
His parents kept their son's collectibles from the movies and display them in their home, but Lewis hates the prime position they occupy.
He tells Britain's Daily Mirror, "They have this weird shrine thing. They hate me calling it a shrine. It's a big glass cabinet in their study at home, and it's got loads of Harry Potter memorabilia.
"To make my ears the prosthetics team had to make a cast of my whole head. It looks like a Victorian death mask. It's horrible. That's right in the middle - it's the centrepiece. And it's got my old wig on it.
"My mum thinks it's cute and shows it to anyone that comes to visit. I'm like 'Mum, don't show my girlfriend that!'"