Aspiring singer and songwriter Ryn Weaver has accused pop star Katy Perry of being a bully.

In her a series of tweets, Weaver made a comment on Perry's tweet of Hilary Clinton and said it was nothing but a paid endorsement and spoke about her bullying behaviour, reports aceshowbiz.com.

"Lol, sorry not sorry olease (sic) open your eyes... This tweet is ignorant if not funded... Bye," Weaver tweeted and added a link to the video with the title "Hillary Clinton lying for 13 minutes straight".

Weaver, who has since deleted her tweets, added later: "No offense @katyperry but considering how much of a bully you were to me... I hope you don't mind my mindful disagreement with your $ endorsement."

The budding singer explained how the bad blood escalated at rapper Drake's gig at 2015 Coachella festival.

"If you must know... She came up to me and my friends... knowing I played... After we were friends... Then stared at me the whole time. She spoke to my friend waiting for me to speak...," Weaver recalled.

"Anytime I spoke, she started turning her head around pretending she heard something... Then said 'do you hear something?' While staring at me... Anytime I spoke. After we were already friends. Did this the entire night..."