The beautiful actress joined her director Sir Kenneth Branagh at a press conference for the live-action Cinderella film on Tuesday, 7 April.
Lily – who also stars in Downton Abbey - looked a-mazing in a flirty Valentino number covered with stars and moon prints. We want, we want, we want!
She's pretty much looked absolutely incredible since starting the Cinderella publicity tour last month so we're quite sorry it's coming to an end now!
While at the Japanese press conference, she came face to face with another Cinderella as the moderator of the event was dressed to impress in the now-iconic blue, corseted gown from the movie.
There was also a treat in store for Lily, who was presented with a Cinderella-themed birthday cake to mark her 26th birthday on Sunday.
Cinderella is in cinemas now.
Watch Lily and co-star Richard Madden in the clip below: