Miley Cyrus play fights with Avril Lavigne on Instagram video

She is arguably the most famous singer in the world right now.

And Miley Cyrus seems determined to keep it that way.

In new pictures and a video posted to Instagram, Miley is seen attacking fellow pop star Avril Lavigne after the pair argue about which of them is 'the most famous person in Canada'.

In the video, posted by Miley, 20, on Tuesday, she wears a Marijuana onesie.

She is seen reading a magazine with a paper stuck to the front showing Avril, 29, with the words 'the most famous beautiful and popular in Canada' scrawled in black pen, as well as 'I heart' and a picture of a marijuana leaf.

Miley, who is currently in Canada for her Bangerz world tour, looks indignant that she isn't given the 'most famous' title.

'I mean I'm in f**king Canada,' she says.

Avril then walks in and strides up to the star.

'Oh hey Miley, I'm actually the most famous person in Canada,' says the Ontario native. 

Miley then jumps up and protests, stating, 'I'm the most famous person in Canada, you dumb f**king b**ch'.

The pair then start play fighting. 'F**k you,' shouts Miley. 

Avril famously came out in support of Miley's controversial VMA performance last year, stating:

'It's actually really funny cause my managers also manage her. She is doing her thing right now and she is kicking a**, so good for her.'

Emma Roberts Geeks Out Meeting One Direction, Lady Gaga at American Music Awards

The actress was tapped to introduce the boys of One Direction prior to their performance the American Music Awards on Sunday, Nov. 24. The American Horror Story: Coven scene stealer was so excited to meet the boy band, however, that she stopped two of them on the red carpet and asked to take a few selfies.

The TV star looked radiant in a Lanvin dress, which she paired with a Rodo clutch and Casadei pumps. "I've been eyeing them for about 20 minutes," she told Jenna Ushkowitz and Zendaya on the red carpet. "I'm so excited to see them. I think they're so talented."

After snapping a snapshot with Liam Payne, Roberts uploaded the picture to Instagram and wrote, "#OneDirection you made my night!!!!

Roberts also took a photo with Niall Horan and added the caption "#omg."

The 22-year-old actress got the chance to meet the rest of the group—including Zayn Malik, Harry Styles and Louis Tomlinson—after they performed their latest single, "Story of My Life." Roberts called the experience "a dream come true."

During the show, Roberts also met another pop music icon: Lady Gaga! The picture was, of course, shared via the actress' Instagram account. "Love," she wrote in the caption.

While Mother Monster wasn't nominated that night, she did take the stage with R. Kelly for a sexually charged performance of their hit song, "Do What U Want."