* Pluto TV: This streaming service offers a variety of popular TV shows, including The Hills. You can create a free account and watch The Hills season 4 with ads.
* Amazon Prime Video: Amazon Prime members can watch The Hills season 4 as part of their subscription. You can also purchase individual episodes or the entire season if you're not a Prime member.
* iTunes: You can purchase individual episodes or the entire season of The Hills season 4 on iTunes.