Kim Kardashian blankets up in a modern cover as her mother stands in for missing sweetheart: With her boyfriend away working, Kim Kardashian was without a date last night. But that didn't stop the reality star from  having fun - her mother Kris stepped in to accompany her to the Los Angeles premiere of Unknown last night. The two had a girly night, and perhaps as a mark of respect to her mother Kim chose to cover up for once.

While the rest of the guests wore the usual premiere uniform of short skirts, Kim, 30, pulled on a futuristic white coat and skinny black wet-look leggings. She seemed to enjoy her night out, tweeting: 'Just saw the best movie! Great thriller!!! Joel Silver's "Unknown" Liam Neeson was incredible!'Reality star Kim also spent Valentine's Day alone, with her basketball star boyfriend Kris Humphries kept away by work.

While Kim covered up, Diane Kruger went for the less is more approach. The actress, who appears in the movie, arrived with boyfriend Joshua Jackson in tiny white dressed cut high at the thigh. Also in the movie is Mad Men star January Jones, who looked deathly pale in a dark blue floor-length dress.

The film stars Liam Neeson as a Doctor who awakes after a car accident in Berlin to find another man has assumed his identity. Kruger plays a young German woman who helps his as he sets out to prove the truth. Jones plays his beautiful wife Elizabeth, who following the accident claims she has no idea who he is.