Rumors on social media are suggesting that Katy Perry and Taylor Swift's ongoing feud will come to blows at Sunday's Billboard 2015 Awards.

Taylor Swift has officially launched poster art for her "Bad Blood" video, which will be shown at the event. Included are a number of a-list celebrities and friends.

But Katy Perry's rivalry with Taylor Swift isn't all fans are talking about.

Katy Perry and John Mayer are rumored to be dating again: the couple was spotted "leaning in for many passionate kisses" and standing very close to one another at the 2015 Met Gala after party.

The on-again, off-again couple was also spotted on a recent date.

"They seemed very comfortable together and kissed several times," a source said, according to the Inquisitr.

But the "Roar" singer's relationship isn't all fans are buzzing about.

Katy Perry and Taylor Swift are slated to compete for the Top Artist accolade at the upcoming 2015 Billboard MusicAwards on May 17.

The nominees announcement sparked rumors that more bad blood will brew between both artists, who are said to be feuding over music lyrics and backup dancers.

She has also recently made headlines for an ongoing lawsuit involving the shark costumes her backup dancers wear in her memorable "Left Shark" performance.

The Left Shark design "identifies only a particular character; it does not function as a service mark to identify and distinguish applicant's services from those of others and to indicate the source of applicant's services," trademark examiner David Collier said, according to Billboard