Jon Hamm and his girlfriend Jennifer Westfeldt were robbed while on a recent stay in London.

The Mad Men actor was in the British capital to promote his new movie Friends With Kids, which Jennifer directed, when her handbag was snatched while at dinner and the key to their hotel room used to take items.

"They were dining at a restaurant and Jennifer's purse was snagged by someone. That person took the hotel key in Jennifer's purse, which had the hotel name on it, and robbed their room. They had to contact the police, it was horrible," a source told Life & Style.

It is unclear exactly when the incident happened, but Jennifer confirmed an investigation was ongoing. "What a mess. I'm not feeling great. It is under investigation," she said.

Jon's representative also admitted the incident had taken place but could not comment further.