D4vd is in jail after being arrested for the murder of 14-year-old Celeste Rivas … and neighbors of the Hollywood Hills home where he was popped are shocked for multiple reasons.

We broke the news … The 21-year-old singer was booked into the LAPD 77th Street Station Jail late Thursday after detectives arrested him on suspicion of murdering the teen. D4vd — born David Anthony Burke — is being held without bail.

Neighbors who live on the same street — not far from the famed Chateau Marmont — told TMZ … they didn’t even know D4vd lived among them when the home he was staying in was swarmed by police.

TMZ obtained a video showing D4vd being handcuffed while surrounded by cops before he was taken to the pokey.

Some of the people we spoke to didn’t even know who D4vd was — but those who did, told us they had no clue he was there. They’d never seen — or heard any disruption from the home. So, yeah … shocking to say the least!

Authorities believe D4vd, who is now 21, had a relationship with Celeste, who was 14 when her body was found.

Celeste’s funeral was held Oct. 6 at Queen of Heaven Cemetery & Mortuary in Rowland Heights, California, where family and friends said their last goodbyes.

D4vd’s Tesla had been abandoned in the Hollywood Hills for a few days before it was towed to a Hollywood impound lot Sept. 5 … and on Sept. 8 cops found the body after getting reports of a foul odor coming from the car.