Chief Keef has been steadily prepping his upcoming debut album, and he's looking to further promote his new single titled "Hate Bein' Sober", which features the likes of 50 Cent and Wiz Khalifa. They've begun to shoot the video for the new track with 50 and Wiz both making appearances, but interestingly enough there was no sign of Chief Keef.

50 Cent wasn't happy at all about Keef's no-show and let the young rapper know about it on Twitter. 

"Its not funny @ChiefKeef didn't sell any records yet,they will pull the plug on him.SMSAUDIO," 50 said in one his tweets. 

He basically warned Chief Keef to get his act together and put an end to his immature behavior before label heads become annoyed with him.

Check out 50's tweets above and click through the slide to get a look at the behind the scenes photos.