"Downton Abbey" star Michelle Dockery

The 'Downton Abbey' actress, who plays Lady Mary in the ITV drama, says she can't stop herself from grabbing the microphone and having a sing-a-long when she's had a drink of alcohol.

She said: "It's starts with something like 'Back To Black' ... Then I will have a drink - because everyone has a drink when they are doing karaoke.

"Then it'll be 'Total Eclipse Of The Heart', and by the end of the night I'll be desperately trying to do Whitney Houston, which never goes down very well for anyone."

While she was in New York last year filming for the upcoming movie 'Non-Stop' with Julianne Moore and Liam Neeson, the cast would head to a karaoke bar in Koreatown and Julianne would grill her on 'Downtown' scoops.

Speaking to In Style magazine, Michelle said: "She's a big 'Downton' fan so she'd want to hear the gossip - I'd try not to give away too much."

However, it wasn't all fun and games during the four months they were filming in the city as she arrived just as Hurricane Sandy hit.

She added: "I was staying on the 34th floor of a building and it completely blacked out."