"He hit on me and asked me out, end of story," the "Real Housewives of Beverly Hills" alum tweets.
Following Butler's "Watch What Happens Live" interview Wednesday night -- where he told Andy Cohen he had "no idea" who Brandi was when he slept with her -- the "Real Housewives of Beverly Hills" alum took to Twitter to slam the "300" star for cringing at the thought of their hookup.
"Let's set the record straight," she tweeted Thursday afternoon. "Gerard Butler hit on me at a party, asked for my phone number, called me up the next day, and asked me out, so if he wants to cringe now, he can f-ck off."
"Gerard Butler did not know my last name or what I did, that is true, but he hit on me and asked me out, end of story. Moving on," she added. "I'm sorry, but when you meet someone that clearly doesn't know who you are, are you supposed to be a dick and say bye I'm famous????"
Glanville was originally set off by Butler's interview Wednesday night after he said he learned who she was after a run-in with the paparazzi.
"When you met her, you didn't know that she was on TV or anything like that?" Cohen asked.
"No idea," Butler replied. "It was kind of a crazy time. Anyway, we hung out, we had fun, and then I never saw her again. And then suddenly, I was walking down the street with a director, and these guys from TMZ come running down the street going, 'Hey, what about you and Brandi Glanville?' And I'm like, 'Who's Brandi Glanville?' Because I didn't even know her last name! So I'm like, 'Who's Brandi Glanville?' She got pretty upset."
50 Cent, who was sitting beside Gerard on "WWHL," told his "Den of Thieves" co-star that "that don't count."
"If you don't know her last name, that didn't happen," 50 Cent joked.
"Then I'm a virgin!" Gerard said laughing.
Brandi didn't find the comment as funny because she immediately took to Twitter following the interview to urge her fans to listen to Gerard's March 2017 interview with Howard Stern if they "want to know the truth."