There is something you can do, but the treatment is not very nice.
Lipodissolve injections will get rid of it. I've had this done, and it does work. Basically it involves a doctor injecting lots of little amounts of fluid under the skin which dissolves the fatty bits. It doesnt' get rid of a lot of fat, the reduction is subtle, but would make a good difference to cellulite.
It is not very expensive (hundreds of pounds as opposed to thousands).
The downside is that the injected area is sore, really sore, and puffy for three to four days afterwards then the swelling goes down and the area reduces in size and looks a lot smoother.
Lipodissolve got bad press in the UK because, insanely, you don't have to be medically qualified to inject it, which is disgraceful, and backstreet places did it and caused problems. If it's done by an actual doctor then it's an effective treatment and quite well known in the US and the antipodes.
If the thought of having injections to dissolve fat are horrific, I have not tried this but apparently in France (where presumably there are lots of very slim women who want smooth legs?) the treatment is endermologie - sounds like a machine pummels the skin and massages the orange peel away. Absolutely no idea of efficacy but it does make a bit of sense, and it's non-invasive.
Maybe someone who has lived in France and had endormologie done can comment?