Twilight heartthrob Robert Pattinson reportedly ignored Katy Perry at the after-party for The Rover on 12 June held at the W Hotel in Westwood, California.
According to a Hollywood Life report, Pattinson tried to avoid the Roar singer.
"Katy arrived and went over to Rob and they were hanging out," an eyewitness told the website.
"Once the buzz started that she was there and once she wasn't getting the attention from Rob that she thought she should be getting, she went outside and hung out with a girlfriend for the rest of the night."
"She was mad that he wasn't giving her the time of day that she thought she deserved," the source added.
In 2012, the 27-year-old British actor ended his relationship with Kristen Stewart, who was his Twilight co-star and girlfriend of four years, after it was confirmed that she cheated on him with her Snow White and the Huntsman director Rupert Sanders.
Ever since he split from Stewart, he has been linked to a number of ladies including Dylan Penn, model daughter of actors Sean Penn and Robin Wright, Elvis Presley's granddaughter Riley Keough, Fast and Furious actress Michelle Rodriguez and his co-star in the Dior ad, model Camille Rowe.
Rumours of a romance between Pattinson and Perry also made the rounds.
Last year, in an interview with Elle UK, the 28-year-old singer offered evidence that there was nothing romantic between them.
"Okay, so here's the proof there was never anything going on with me and Robert Pattinson," she told the magazine. "I fart in front of him. Properly fart. And I never, ever fart in front of a man I am dating. That's a rule."