You can find styles still in stock here.
Styles that were taken off the Lipsy site or have gone out of stock can be viewed in this article, along with those that are still in stock.
On February 2, 2016, Lipsy began teasing that they had a "new international celebrity collection". The next day, they shared that Ariana Grande would be the collaborator. It was announced that Ariana would be releasing a Spring 2016 collection as well as a follow up Summer 2016 collection. She would also have a jewelry line. The collection is described as "fun, flirty and iconic".
You can ready the full press release here.