Jennifer Love Hewitt celebrates turning 30 by dressing up like Audrey Hepburn

What better way for an Audrey Hepburn fan to ring in a birthday than to have breakfast at Tiffany's? That's exactly what Jennifer Love Hewitt did to mark turning 30 over the weekend.

The Ghost Whisperer star, who starred as her idol in the 2000 made for television biopic The Audrey Hepburn Story, dressed up like Hepburn's Breakfast at Tiffany's character, Holly Golightly, in a little black dress, long black gloves and a tiara on Saturday. She then had breakfast – a croissant and coffee – at Tiffany's in Beverly Hills.

"My mom worked that our for me," Hewitt told PEOPLE at The Envelope Please AIDS Project Los Angeles Oscar viewing party in West Hollywood on Sunday.

"It was amazing. I had a great day," Hewitt beamed, showing off a pair of Tiffany diamond stud earrings and a Tiffany diamond cuff bracelet that her mother, Pat Hewitt, gave to her as a birthday gift.

On Saturday evening, family and friends, including Ghost Whisperer costar Jamie Kennedy, all partook in the Hepburn theme at The Montage Hotel in Beverly Hills.

"The whole cast, we all went and all the women were Audrey Hepburn and all the guys were George Peppard," Kennedy tells PEOPLE. "I played it off by wearing a skinny tie." via