I heard it's the London look

It's the Gap.

The title stole my comment.

Like that girl on those Maybelline commercials saying "Get the London Look" with a big-ass gap and she's getting arrested.

"Get the London look"
*goes to find hammer and smashes between my front teeth*

I personally think diastema (gap teeth) is both beautiful and interesting, quirky maybe. Georgia Jagger and Lara Stone are both immensely gorgeous, and there's a certain attractiveness about them. It makes them look perfectly imperfect, and natural, and lovely, and just... human.