I have a LONG way to get to that point. But even if I tried I wouldn't achieve that shape since I have large hips in my bone structure. Ah well, some people aren't born with a willowy bone structure like that photo you posted. But then again, there are people like Catherine Zeta Jones with more 'curvy' builds, so I guess it isn't that bad for me :D
However, as of right now if I tried on a bikini I'd look like this (warning, close your eyes):