Ben Stiller is hanging his head in shame after touring the White House with English comedian Ricky Gervais, who showed up in extremely casual threads.

The actors, who co-star in upcoming film ” Night at the Museum: Battle of the Smithsonian “, paid a recent visit to Washington to premiere the new movie.

Gervais had already sent his business attire to the dry cleaners when they received a last-minute invitation to the presidential mansion and ” The Office ” star was determined to make the trip even if it meant posing for pictures in less than appropriate gear. Stiller is still haunted by his co-star’s crude behaviour.

“I went (on the tour) with Ricky Gervais because he’s in the movie. They told us to dress business. I wore a suit and tie. And Ricky Gervais, British Ricky Gervais, shows up in a black T-shirt and draw string yoga pants. It’s very beyond casual – like ready to meditate or something. And then he’s running around like, ‘Oh, this is where our American president lives! Where’s the dog?’,” said Stiller.