Victoria's isn't that deep, IMO; you can usually see the bottom of it in most of her pics.
Honestly, there are far too many innies to get a good reading on this. Off the top of my head, I do think Taylor Swift's earns consideration, though.
I agree about Victoria's not being deep enough, especially when the light hits it at a certain angle. The same can be said about Bella Thorne's. As For Taylor, we need more pictures, two or three are not enough proof, damn it!
Also, I'd like to replace Rachel Leigh Cook with Jennifer Lawrence as my #3 deepest. RLC hasn't been in the limelight for a while, and J-Law's innie looks pretty damn bottomless. And an honorable mention: Nikki Soohoo.