Brielle Biermann debuted a new hair color earlier this week.

Kim Zolciak Debuts Thin Waistline & A $10,000 Chanel Purse, Tells Fans She's 'Spoiled'

Over the weekend, the daughter of Don't Be Tardy star Kim Zolciak revealed a new, lighter look on Twitter. Then, on Christmas night, she shared a second photo of the look with her fans on Instagram.

"Merry Christmas to all and to all a goodnight," Biermann wrote on Thursday, along with a photo of herself, showing off her blonde locks, and her boyfriend.

Kim Zolciak's Twins Kane Rem & Kaia Rose Kroy Biermann: Sister Brielle Zolciak Gushes About Siblings On Twitter

Fans have watched Biermann on reality TV for the last several years. First, she appeared alongside Zolciak in The Real Housewives of Atlanta. Then, years ago, Zolciak and her family, Biermann included, landed their own spinoff, Don't Be Tardy, which is currently in hiatus after wrapping its third season in September.

While Biermann hasn't said much about her hair, she did reveal it looked "white" to fans on Twitter days ago.

"My hair is white," she captioned the first photo of her new look.

After Zolciak wed Atlanta Falcons player Kroy Biermann in 2011, Brielle and her younger sister, Ariana, took his last name. As fans of The Real Housewives of Atlanta will recall, both Brielle and Ariana's fathers have been out of their lives for years.

In addition to her two daughters, Zolciak has four children with Biermann, Kroy Jagger, Kash Kade, and twins Kaia and Kane.

Don't Be Tardy is expected to return to Bravo for a fourth season. However, the network has yet to officially announce the news.