What is a humble brag?

"I am well aware that I am the 'umblest person going," said Uriah Heep, modestly. 
Charles Dickens, David Copperfield
The modern humblebrag has several niche forms. One is the casual reference to showbiz pals/contacts. 
"I’ve been seen with Lady Gaga and Benedict Cumberbatch. My puppy turns more heads" 
Caitlin Moran The Times, April 22, 2017
“Watching @blakeshelton perform on late night TV right now… He’s a damn fine singer and a great guy. Congrats on the success buddy.”
Jake Owens, grabbing some reflected glory from fellow country singer Blake Shelton.

Another clever humblebrag is to over promote yourself in the celebrity pantheon: 


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