Downton's Michelle Dockery is Vanity Fair covergirl The actress is a cover girl for the latest issue of US magazine Vanity Fair, which hails her as one of the "most watchable women" on television. For her cover shot, Dockery, 30, posed in bed with US actresses Julianna Margulies of The Good Wife, Sofia Vergara of Modern Family and Claire Danes of Homeland, the hit drama currently showing on Channel 4. "This quartet represents four of the best shows currently, or ever, on the air," said the magazine, which described Downton Abbey as "a sophisticated sensation." The ITV costume drama has been a hit in the US, winning four Emmy Awards and the Golden Globe for best mini-series. In the accompanying interview, Dockery said she was still getting used to transatlantic fame. "I think the first time I realised Downton Abbey was a hit was when I was sitting in a tea shop in New York and the couple next to me were talking about Downton Abbey and then they recognised me," she said. While the show remains ITV's most popular drama, the new offering from writer Julian Fellowes has failed to match its success. Ratings for Titanic, one of the most expensive British television dramas ever made, have dropped by three million. :: The May issue of Vanity Fair is on sale from Friday