A socionic ESTj, yes:
http://www.socionics.us/celebrities/lse.shtml
Though, I think she is ESTP on MBTI. ESTJ testify about being serious, rule-follower teenagers who forget to have fun. Milla testifies about being a loyal but rebelious, reckless and rule breaking teenager. It's very visible in interviews, she has a lot of energy, she always need to move. SP, not SJ/ Also, I don't see Si, but clearly Se.
In MBTI, the difference J/P is between judgers and explorers, and, well, she's pretty much an explorer.
On that link, she's compared to Sandra Bernhard, an ESTp, I think she may be an ESTP too, and a 6w5 Sx/So (which explains also why she's similar to the 6w7 Sx/So Milla J).