Harry Styles was nowhere to be seen at ex-girlfriend Taylor Swift's epic Billboard Music Awards after-party in Las Vegas on Sunday night.

The "Bad Blood" singer threw a star-studded bash at Nobu Hotel Caesars Palace's Nobu Villa in celebration of her taking eight awards home. Swift won for Top Artist, Top Female Artist, Top Hot 100 Artist, Top Digital Songs Artist, Top Billboard 200 Artist, Top Billboard 200 Album and Billboard Chart Achievement Award (Fan-Voted).

On the following day, Swift's younger brother took to his Twitter account to share a split photobooth shot, posing alongside Ed Sheeran, Swift and her boyfriend, Calvin Harris. Styles' One Direction bandmates, Louis Tomlinson and Niall Horan, also attended. 

HollywoodLife then insinuated that the "Steal My Girl" crooner still has not moved on from his former lover, who showed major PDA with her new beau and the winner of Top Dance/Electronic Artist at this year's BBMAs, following their breakup back in 2013.

"Taylor has never been happier, and last night was her sweet revenge on Harry," an insider revealed. "She was over the moon that Harry was there to witness how crazy she and Calvin are for each other."

The insider added that Swift was happy to show Styles that she is "completely over him," and Harris "rocks her world, more than Harry ever did or could."

Meanwhile, the "Midnight Memories" hitmaker and his other ex-fling, Kendall Jenner, were recently rumored to be rekindling their romance.

According to HollywoodLife, the 1D lothario and the "Keeping Up with the Kardashians" star, who split after just three months of dating in 2013, have been "talking and texting again," although they are "just friends" for now.

"The conversations can be flirty as Harry can't help himself," a source revealed, adding that the two have been planning to go out with their friends when the British singer is in Los Angeles and available.