Christina is a seamstress that works at Mode and also Betty's friend and confidant.  She is originally from Scotland where she married a man named Stuart who shows up in seaosn 2.  Christina is also the surrogate for Wilhelmina and Bradford's child.

Christina McKinney Quotes

I had a piece of your hair tested. They found Oxycontin and heroine. It's like Rush Limbaugh and Amy Winehouse fornicated and had you.

Christina

Betty: But I'm working for Wilhemnia.
Christina: I know, The wicked witch of the east side.

Ugly Betty Quotes

Christina has to empty the closet, she has to make room for the spring collection. You really should take a trip down there Betty, they might have a pair of socks your size

Wilhelmina

Marc: I'm not going stag, hag
Amanda: You'll have to buy your own beer, queer