updated 08/19/2011 AT 12:05 PM ET
•originally published 08/19/2011 AT 11:35 AM ET
With the big day fast approaching, Kim Kardashian and fiancé Kris Humphries celebrated their wedding rehearsal dinner with friends and family Thursday night at Scarpetta, an Italian eatery inside the Montage Beverly Hills hotel.
“They both looked amazing and very happy to be celebrating their upcoming wedding,” an eyewitness tells PEOPLE of the soon-to-be newlyweds. Adds a hotel source: “Kim and Kris rented the whole restaurant for their special celebration.”
About 75 people were in attendance at the three-hour event, including Kim’s stepfather Bruce Jenner, and sisters Khloe, who Tweeted “such an amazing night with my family and friends,” and Kourtney, who arrived with boyfriend Scott Disick and their son Mason.
Guests enjoyed a cocktail reception followed by a lavish sit-down dinner. “Kim and Kris were hand-in-hand and side by side for most of the night,” says the witness. “Kim was beaming and looked absolutely gorgeous. During dinner, there were some heartfelt speeches and tears, but mostly laughter. Everyone seemed to have a great time.”