This is actually the second time she did this. 
Last night I was holding Tatiana and she was drinking her milk.  I was nuzzling her cheek with my nose.  She stopped drinking milk, and gave me an eskimo kiss!  It was really wonderful.  I was very happy.  I told Scotland, "Look at this!" and then we did it again.  I think because it was making mommy very happy, she did it several more times.  And her eyes would light up when she did it.  It was magical.

The first time she did it was a couple of days ago during coo-coo time.  I don't remember what started it.  After, I just had show Scotland what she did.  Then I handed her to him, and they eskimo kissed too.