Los Angeles, Aug 22 (TIWN) Actor Gerard Butler accidentally flashed 400 guests at his sister's wedding as he forgot he was not wearing an underwear underneath his kilt.

The 300 actor came clean about the awkward moment during an appearance on Conan, explaining his mum was the one to let him know about the wardrobe mishap.  Setting the scene, the 49-year-old explained he donned a traditional Scottish kilt to sister Lynn’s nuptials, and decided not to wear anything underneath it.  ‘I’ve not worn a kilt as much as you’d think. I wore a kilt at my brother’s wedding and at my sister’s wedding, and I loved it both times, but they were both disasters,’ he said.