Kanye West just trashed Chris Brown and Karrueche Tran in a new rap with Ariana Grande's boyfriend, Big Sean. Meanwhile, the "Loyal" singer reportedly greeted his ex, Rihanna, on her 27^thbirthday.

According to Hollywood Life, Kanye West collaborated with Big Sean for the song "All Your Fault."

In the track, Kim Kardashian's husband can be heard telling Karrueche Tran that she shouldn't let go of Chris Brown because she will never "find a guy as good as Chris."

An excerpt of "All Your Fault" has Kanye West singing:

"Young Walt Disney, I'ma tell you truthfully

If you leave Mickey you gon' end up with a Goofy

I imagine that's what Chris told Karrueche."

"Chris and Karrueche have a complicated relationship that's been full of breakups and makeups, but their love always seems to conquer in the end," Hollywood Life added.

Meanwhile, another news report would definitely not sit well with Karrueche Tran as it alleged that Chris Brown reached out to his ex, Rihanna, to greet her on her birthday. Their tumultuous relationship ended with domestic violence, for which he served hours of community service.

"Because they are not together now people think that they don't speak any at all but they are still friends and still care about each other," the source told Urban Islandz.

"Chris called her this morning after she landed in LA and wish her a happy birthday. The call lasted a few minutes and was candid and of course RiRi thought that was a sweet gesture," the insider added.

The relationship between Chris Brown and Karrueche Tran has been marred by rumors of him cheating. Their split can be ugly and almost always spills over to social media. They broke up late last year but they seemed to have reunited during the Christmas holidays.