He's puttin' in that quality time with Gramps!

Justin Bieber rolled to the recording studio in Santa Monica last night with an unlikely collaborating partner -- his grandfather Michael! We wonder what his grampy thought of this hideous head-to-toe read outfit? Michael Mallette is JB's mom Patti's dad and he lives in Canada, so he must be down in sunny California paying a visit to his pop star grandson.

The Biebs certainly doesn't seem to be crying over Selena Gomez's declaration that she's never ever getting back together with him! In fact, sources allege the "Sorry" singer is actually relieved the "Come & Get It" songstress has finally given up on their relationship.

"Justin feels that if he talks to or sees Selena Gomez ever again he will not have that feeling that he needs to get back with her. There has been so much back and forth that it is now to the point where it is more harm to go back to Selena in his eyes. Justin is content knowing that he will never date Selena ever again," a source dished to Hollywood Life. Ouch! That's gotta sting for the brunette beauty.

On a totally unrelated note, where the hell is Hailey Baldwin? It's pretty clear he hit it and quit it!