Paris Hilton and electronics duo The Chainsmokers have been added to the LA-based Australian expat startup’s A-lister cap table Checkmate, which raised $15 million (A$23 million) in a Series A.

The round was led by GV (formerly Google Ventures), backed by DJ duo Alex Pall and Drew Taggart’s VC fund Mantis, plus several other US funds including Common Metal, BDuck Capital, Black Angels Group and F7 Ventures, plus Trevor Neff of Ashton Kutcher’s Sound Ventures. Home, existing investor Blackbird, plus the co-founders of Sendle and LinkTree. Checkmate’s backers already include NFL star Joe Montana’s Liquid 2 Ventures.

Other investors include Fuel Capital, Kevin Johnson, the former CEO of Ebates at Rakuten, Ancestry CEO Deborah Liu, Firstbase CEO Chris Herd, XMTP co-founder Shane Mac, f7 Ventures, Scribble Ventures, Hyper, Susa Ventures, Wischoff Ventures, Exits Capital and Night Capital, many of whom contributed to Series A.

Checkmate is an online shopping tool that helps users discover brands, apply savings, and manage orders after purchase. It works as a mobile app and PC Chrome extension to collect the best deals from a user’s personal email and web, then automatically apply them to a user’s online checkout.

It’s only nine months since the startup, co-founded by three Australians, raised US$5 million (A$7.75 million) in a Seed round last September.

Checkmate’s dashboard also stores and manages gift cards and tracks orders for customers. Users can also choose to have Checkmate generate a first-of-its-kind “ghost email inbox” that subscribes them to the top 100 retail and brand mailing lists for deals without having to personally browse offers. The platform then automatically applies all relevant deals from the inbox for users as they shop.

The smartphone plugin topped downloads on the Apple App Store late last year and now has more than 400,000 users, including 60,000 daily active users. More than 2000 users have tried the Checkmate app, with a 4.5 star rating.