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You may be on to something. From her Wikipedia article:

Her mother is Monica Braithwaite, a retired Afro-Guyanese accountant, and her father is Ronald Fenty, a warehouse supervisor of Barbadian and Irish descent.

So her father is partially Irish. Also, if you read the article on Afro-Guyanese people:

Afro-Guyanese people are the inhabitants of Guyana of Sub-Saharan African descent (formerly, as the Afro-Guianese they were the inhabitants forcibly brought as slaves to work on the sugar plantations of British Guiana).

[...]

By the early twentieth century, the majority of the urban population of the country was African Guianese. Many Afro Guianese living in villages had migrated to the towns in search of work. Until the 1930s, Afro Guianese, especially those of mixed African and European descent, comprised the bulk of the nonwhite professional class.



So Rihanna's mother is descended from slaves brought to British Guiana, and it is possible that there was mixing of African and European ancestry at some point in Rihanna's mother's heritage, just as the descendants of African slaves brought to the U.S. sometimes mixed with Americans of European descent (or, sadly, the slaves themselves were forced to breed with their white masters).

Rihanna is black

You sound like an idiot

I'm lighter than her and I'm not biracial.

Rihanna is black

^^^This.

How does that in any way contradict what I said? Obama is biracial and identifies as black. Rihanna has partial European heritage, and she is black.

Must dash. I forgot to feed my wombat.

It's just my opinion, but when someone says they're "mixed-race" or "bi-racial" they should only say that if they have parents that are from different ethnic/racial backgrounds and they grew up in a household where both ethnic and cultural aspects were experienced.

Genetically speaking, a majority of people labeled Black or African-American have a substantial amount of European DNA and in many cases it can be seen in their physical features, but sometimes it isn't as clear cut as many Black people are darker and "look" more African to the common observer.