While successfully kicking off this year's American Music Awards with her theatrical live performance of "Blank Space" on Sunday evening, Taylor Swift reportedly managed to diss ex-boyfriend Harry Styles.

At Nokia Theatre L.A. Live in Los Angeles, Swift belted out the former lover-inspired track off her fifth studio album "1989" that features lyrics as follows:

"Cause we're young and we're reckless / We'll take this way too far / It'll leave you breathless / Or with a nasty scar / Got a long list of ex-lovers / They'll tell you I'm insane / But I got a blank space baby / And I'll write you name."

HollywoodLife.com reported that towards the end of her impressive performance, the "Shake It Off" singer made eye contact with Styles and then pointed her finger at him in the audience.

How did the One Direction member react to this? He apparently turned to his bandmates and simply smirked.

Moreover, Harry Styles, who took home three awards, seemed to be respectful during Taylor Swift's acceptance speech for the Dick Clark Award for Excellence, as a fan took to Twitter to share a snapshot of the moment:

In addition, an insider recently claimed to the same website that Swift has not moved on from Styles at all and is still interested in him: "Taylor is so excited that she and Harry are talking again. She was in love with him and he broke her heart -- that's why she hasn't dated anyone since him."

"She still likes him. Taylor won't admit it, but she's not over Harry," the insider added. "She practically does a happy dance whenever she hears from him, and she analyzes every word he says. She's obsessing over him and finds a way to bring him up in every conversation, that's why even her trainer knows they're talking again."