Kanye West showed his total disdain for Taylor Swift back in 2009 when he callously interrupted her acceptance speech at the MTV Awards. He went on the stage, grabbed the mic from her and said, "Yo, Imma let you finish, but Beyonce had the best video of all time."

Other stars who were at the awards show were also visibly shocked at West's crass interruption. Later, after Beyonce received an award, she graciously gave her acceptance speech time to Swift to make up for West's outburst.

Apparently West's dislike of Swift - or maybe his envy of the pop star - continues. He is reportedly not happy with Swift potentially collaborating with his good friends Jay Z, Beyonce and Justin Timberlake.

When Swift celebrated her 25th birthday on Dec. 12, many were surprised to see Timberlake, Jay Z and Beyonce at her party together with the "Shake it Off" singer's other friends like Karlie Kloss and Selena Gomez. A source from Hollywood Life claims that the three were there not just to celebrate, but to discuss future projects that they could work on all together.

"Taylor Swift's birthday was not just a fun celebration, it was also a business meeting for her, Jay Z, Beyonce, and Justin Timberlake. Name me four other people that are more powerful in the world right now. Jay Z is aware of this and wants to work with them," the source said.

Apparently, West isn't pleased that he is not part of the musical foursome.

"Kanye doesn't see things over his ego very often--if ever--and he is upset that he isn't in the club with Taylor, Jay Z, Beyonce, and JT," the source added.

Adding fuel to the West/Swift feud is a previous report from Star magazine. "There's just something about Taylor that sends Kanye into a rage," said the source to the publication. "He just doesn't get why she's so successful."

West allegedly "lost it" when he found out that her "Shake it Off" video attracted more than 380 million views while his "Bound 2" video only had 45 million views, the Christian Post reported.