New Mom January Jones Slips into $900 Leather Pants!

 Tom Meinelt-Jason Winslow/Splash News Online

January Jones is one edgy mama!

After debuting "rose gold" streaks in her hair last week, the new mom, who gave birth to son Xander in mid-September, slipped into skin-tight black leather pants!

While walking through NYC on Monday, the Mad Men star showed off her slim and trim post-baby bod in J Brand Super Skinny Leather Leggings paired with a fur-trimmed toggle coat and a grey, loose-fitting top.

Jones' leggings comes at a pretty price, however. The luxe, 100 percent lambskin leather pants retail for $895! They also come in grey, red and white. (Get them at jbrandjeans.com.)

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The 34-year-old isn't the only star who has taken a liking to the slick and edgy leggings. Lauren Conrad couldn't get enough of the pair from her Paper Crown collection last fall while Kristen Stewart was spotted teaming hers with a delicate and feminine blouse in London earlier this month.

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