Diamonds really are a girl's best friend! Hollywood's biggest stars were shinning bright as they gathered to help celeb jewelry designer Neil Lane unveil his flagship store Wednesday night in Los Angeles. Stars Tori Spelling, Lisa Rinna, Nicky Hilton, Debi Mazar, and Rachel Griffiths joined the designer at his glitzy new boutique to celebrate its opening.

Watch the celebs tell ET why they love Lane's pieces! Over the past few years, Lane has designed pieces for celebrities like Reese Witherspoon, Charlize Theron, Renee Zellweger and Angelina Jolie. The notable designer's jewels have also been featured on the covers of Vogue, Harper's Bazaar, W and other leading fashion mags.

"Now we got it all under one roof, one showroom, one showcase," Lane tells ET. You can see his fabulous jewelry collections at Neil Lane's flagship store located on La Ceinega Blvd. in Los Angeles.