One's a ravishing blonde; the other's a gorgeous brunette. But, there was a time that Kim Richards and Kyle Richards had the exact same hairstyle — and we have photographic proof! 

On September 19, Kyle took to Instagram with a sweet birthday message for her big sister. "Happy birthday [Kim] I hope this year is magical and brings you much love, health & happiness," she wrote. "Love you." Aww. 

To go along with the birthday wishes, Kyle posted a series of throwback snaps that began with a black-and-white portrait of the sisters. And, speaking of magical ... 

In the snap, The Real Housewives of Beverly Hills pals have long, flowing, super-straight locks and some strong matching bangs game. (And a cat, but that's another story.) Take a look at the cute snap, below: 

Of course, those who have been on Richards' hair watch for some time now will recall this epic '90s bangs style, as well. So it's official: These sisters have been killing the coif game for decades.