Yikes! Taylor acted cold as ice when she bumped into Harry backstage at the BRIT Awards on Feb. 20, as she wouldn’t even look at her ex.

Taylor Swift is acting more immature than ever. Harry Styles clapped for Taylor when she presented an award, then he said she “looked great” during her performance of “I Knew You Were Trouble,” and Taylor has returned his nice gestures by refusing to make “eye contact” with her One Direction ex backstage at the BRIT Awards. Read on for all the details.

Taylor Swift Disses Harry Styles Backstage At The Brits

Taylor and One Direction both performed at the Awards show in London, and a report says they bumped into each other backstage and Taylor decided to totally burn Harry instead of saying hello or smiling.

“Taylor and her people passed Harry backstage and a security guard barked, ‘Look left!’ so there was no eye contact,” an onlooker tells The Mirror.

So uncool Tay Tay! Let’s just hope she was super nervous about seeing her ex, but this not the first time Taylor, 23, has dissed Harry, 19, publicly.

Taylor’s Other Public Disses To Harry

At the 2013 Grammy Awards on Feb. 10, Taylor spectacularly dissed Harry when she sang “We Are Never Ever Getting Back Together” in an English accent. The following day, she dressed up exactly like Harry to film her new music video for “22”, and Taylor mocked the Dirty Dancing lift that they did together at the Jingle Ball on Dec. 7.

HollywoodLife.com‘s Editor In Chief Bonnie Fuller thinks that Taylor needs to stop dissing Harry and move on from their bitter break up. Bonnie says that Taylor should be careful that she doesn’t get “a reputation as a total romance revenge obsessor” and that if she continues on this warpath she will “look bitter when you really want to look bigger than all this.”

What do YOU think HollywoodLifers? Does Taylor need to grow up? Was her diss mean?

WATCH: Taylor Swift Wears Wedding Dress For Harry Styles At Brits

http://www.youtube.com/watch?v=UlG9L4xNFaw&feature=player_embedded

— Eleanore Hutch

More On Taylor Swift & Harry Styles At The BRIT Awards:

1. Taylor Swift Teases Harry Styles In Black Lingerie During BRIT Awards
2. Will Taylor Swift DARE To Diss Harry Styles At The BRIT Awards?
3. Taylor Swift & Harry Styles Both Performing At BRIT Awards