Writer/director Guy Ritchie is currently filming his version of Sherlock Holmes in London and Just Jared has posted a picture of star Robert Downey Jr. dressed up as Holmes on set. In addition to Downey Jr., Holmes also stars Jude Law and Rachel Adams. Ritchie's RocknRolla is now playing in theatres and Downey Jr. can be seen alongside Jamie Foxx next month in The Soloist.