West, 37, was dining in the same restaurant where the bachelorette party was going on.
Jess Kingsbery, a friend of the bride-to-be and a few other guests who were huge fans of the star, asked a waiter to send a bottle of bubbly to his table, but Kanye switched things up, reported E! Online.
"The waiter brought it over and said the champagne was compliments of Mr West and his party. It was so crazy, we could not get over it," Jess said.
A guest named Alison Dempsey shared another picture taken at the party along with the caption, "Just a pic of the bachelorette thanking Kanye for the bottle of champagne he bought for us."
Jess added that when people asked about West's married life with Kim Kardashian, Kanye said it was great.
"It was such a fun surprise. He was very, very nice. It was the best night of our lives," Jess said.