Gwen Stefani kicked off her US tour along with the grand opening of The Pearl Concert Theater at The Palms hotel in Las Vegas. The theater cost $80 million dollars to build but only holds 2,500 people. It does, however, have state of the art wiring for "artists to create a cost-effective live album with efficiency and without additional venue set-up." It also includes amazing luxury boxes, private bars, lounges and more. Sounds perfect for Vegas! The opening night with Gwen also brought out famous folks like the Hiltons, Tommy Lee and more.

Lots more images including Tommy Lee, Eric Balfour, Nicky Hilton and more so read more

Images include Nicky Hilton, Romany Malco, Tommy Lee, Eric Balfour, Brian Baumgartner, Kimberly Stewart, Gwen Stefani, Gavin Rossdale.