It's no secret we're a little obsessed with Lady Gaga.

Whether it's totally fabulous or borderline insane, her fashion-forward sense of style is artistic, gutsy, and really fun to write about. Which is why we think Lady Gaga is one of 2009's best Halloween costumes (edging slightly ahead of Balloon Boy, in our book).

In fact, one StyleList staffer and a group of her friends are all dressing as Lady Gaga - each one in a different epochal costume she wore in the past year.

So we begged Romero Jennings, the MAC senior artist responsible for many of the amazingly technical looks we see backstage at fashion week, to come to our offices to transform our intern, Lindsey, into Lady Gaga
And, as you can see, he did!

Scroll over the image above to see Lindsey's transformation, and click through the gallery below for Jenning's tips, and the step-by-step on getting Gaga-licious this Halloween.

For more great costume ideas, visit the MAC Facebook Page.