I say yes

The trinity is incorrect.

Overall no?

Of this generation in mainstream music,

Beyoncé and Kelly Clarkson are. There is no 3rd person I can think of.

If we're only using Top 40 bithces then yes, or maybe Gaga instead of Christina.

If we're talking about all kind of singers then only Kelly stands. The disproportionality of the size of the pictures in the OP

Kelly is the only one that really belongs to be in any trinity. Beyonce not really, although she's very good. Christina should not even be an option.

Oh you noticed that

I just noticed it's a gif But it's only fair when you are everyone's 1st option of the trinity.

Only Xtina and Beyonce. Kelly is just... lol

Katy, Rihanna, and Ke$ha

Kelly's belts have a bit more power than Beyonce's once they get to F5/F#5 and above and are very resonant, that's it. Beyoncé trumps her in everything else.

I'd take out Christina.and put that girl in that sing 'bleeding love'

You forgot about the fact that Kelly is A LOT more versatile then Beyoncé. Kelly can sing anything and I can't say the same for Beyoncé.

Christina isn't of this generation's "vocal trinity."
I'd say Beyonce, Kelly, and Adele.

Yes. If you take everything into account. There were better singers then Celine around her time period too. But none of them were as successful as her, thus her being grouped with Mariah and Whitney. Same goes for Christina really. You sorta need to be successful, otherwise no one will know who you are.

I cringe when people mention Adele. Adele has a unique voice, that's pretty much it.

Xtina yes. The other two lol no.