January Jones

Jonathan Leibson/Getty Images

Thank the peroxide gods—January Jones is a blonde again!

The Mad Men star debuted her newly highlighted tresses Tuesday at Sundance Film Festival. Back in June, the 35-year-old star dyed her famously flaxen hair red.

While she looked great with both colors, we're sure Betty Draper Francis would be pleased Jan is back to blond.  

And we're pleased that the sixth season of Mad Men comes back to AMC on April 7!

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