^^Nah, I just checked. She's a natural brunette, who went blonde pretty recently.
The blonde looks amazing on her. I don't think there's been one picture where her roots were seen or where the blonde looks tacky and ersatz. I know its just me, but IMO roots look absolutely terrible and ruin the entire look for me - Candice Swanepoel for instance.
Amber, however, rocks the blonde like nobody's business.