January Jones Shares New Tattoo in Honor of Her Son Xander -- See the Pic!

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The actress' 5-year-old son is apparently already quite the fan of her new ink.

January Jones just got inked!

The Mad Men star showed off a new tattoo during her appearance on Wednesday's Late Night with Seth Meyers, revealing she got the body art in honor of her son, Xander.

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"It's my birthday and his inside," she explained, pointing to two circles in the design and their corresponding numbers. "So I'm protecting."

The mother of one actually debuted her new ink on Instagram just a few days before.

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"We do fake tattoos on him all the time," Jones told Meyers, adding that the 5-year-old loves her new tattoo. "He was like, 'That's never gonna wear off!' He was very proud that I wanted that."

Xander isn't the only member of Jones' family in love with her new ink.

"My mom asked me to be put on Dr. Woo's wait list," she said of the celebrity tattoo artist. "He has like a five-year wait list."

But back to Jones' son -- the tot recently turned 5, and the actress couldn't help but celebrate with an adorable throwback pic.

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See more in the video below.