- I never knew Lorde was half Croatian
- I also thought Nicki was of 100% African ancestry, but she's Afro-Indian
- Freddy Mercury is a Parsi man from the island of Zanzibar
- Nicole Scherzinger doesn't have any African-American blood, she's just Hawaiian, Filipino and Russian/Ukrainian
- I think Britney is like 1/16th Maltese
- Olly Murs is 1/8 (?) Latvian
- Brenda Song is 50% Hmong and 50% Thai, thought she was half white
- Queen Miranda Cosgrove is just Irish, English and French when I thought she had some eastern admixture
Any more you can think of?

Wentworth Miller is half-black Is that even ethnicity?

Cameron Diaz being part Cuban. Pretty much any caucasian celebrity who are part Hispanic surprises me!

1/16th lol that honestly doesn't count for anything

Demi and Selena being latina.

I thought Miranda Cosgrove was Serbian. That's what I heard.

She's biracial. Her mom is white.

I was surprised when I discovered that Rashida Jones is half-black.

And even more surprised when I discovered that her parents are Quincy Jones (the producer) and Peggy Lipton (the actress from Twin Peaks).

Nah, really? I need to look that up...

Vanessa Williams from ugly Betty being black. I thought she just had a tan.
Rita ora being 100 white.

Aloe Black always sounded like a white man to me.

Sandra Bullock is half German.

Gaga being Italian

Alicia Keys isn't fully black. And Bruno Mars is so racially ambiguous, I thought he was mixed black, but apparently he just has really strong filipino genes.

That Mariah Carey is half black

... ? ? ? ? She is?