Which is the most attractive "Dr. Who" companion?

I was never thrilled with the look of "Rose" actress Billie Piper. 

She hasn't particularly aged well...

However, I really love the look of Karen Gillan as Amy Pond.

I love how Karen Gillan's cousin Catlin Blackwood played the young version of Amy Pond.

Now Catlin Blackwood looks like her much more famous cousin.

Although she wasn't my favorite at first, Jenna Coleman has won me over with her beauty.