I assume that means Brown found a "Pamunkey princess" or the equivalent in his family tree. The situation is probably similar to this one:
Debating Alesandra Nicole's background
Inked model is Pamunkey?
Indians respect women
A Native columnist weighs in on Brown's identity:
Chris Brown--Your Actions Will Show If You Are Really Indian
By Ruth Hopkins
Is Chris Brown really Native? Who knows. He wouldn’t be the first non-Native person I’ve heard claim that their great-grandmother was a ‘Cherokee’ Princess, and he won’t be the last. I hope his claim of Pamunkey heritage isn’t just another ploy to get him more attention and sympathy. In pop culture, Native stereotypes are ‘in’ right now. One only need watch a music video with some non-Native trollop dancing around in a fake warbonnet, or browse the latest ‘Native inspired’ apparel at a local Urban Outfitters to realize that.
If he is, I’d like to see him sincerely embrace his new-found indigenous heritage. We’re more than beads and feathers. I wonder if Chris knows that one of the most famous members of the Pamunkey Tribe is a woman? Cockacoeske (ca. 1640–ca. 1686) was chief of the Pamunkey Tribe for more than 30 years. She was known for maintaining unity, and led several other Tribes besides her own. She played an active role in the Bacon Rebellion, and negotiated with the British crown as well as European colonists. If fact, she was one of the first of the tribal leaders to sign the Virginia-Indian Treaty of 1677 and 1680. If Cockacoeske were alive today, I bet she’d give Mr. Brown the scolding of his life.
Today the Pamunkey people are highly involved in preserving their culture and natural resources. If Chris genuinely possesses Pamunkey ancestry, it is his duty to support his people in their endeavors. Additionally, Native women experience the highest rate of violence among any other group in the United States. I suggest that Chris find the true road to redemption by turning attention to the plight of native women, as well as women everywhere, who fall prey to domestic violence.
For more on Native identity questions, see Winddancer Called a "Cultural Thief" and Natives Aren't Vanishing in Census.