Jay Leno is still taking some cracks at NBC for pushing him out of the Tonight Show. ​

Leno quipped:  “After being booed at the Billboard Music Awards (Sunday) night, Justin Bieber said, ‘I’m 19 years old. I think I’m doing a pretty good job.’ Hey Justin. I’m 63. I thought I was doing a pretty good job. Welcome to show business, pal.”
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