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While Christina Aguilera has been busy passing out in Jeremy Renner's bed and getting her party on with boyfriend Matthew Rutler, soon-to-be ex-husband Jordan Bratman has been on daddy duty with their adorable son Max.

We snapped father and son running errands in Brentwood today, and the duo looked like they were having the time of their lives. Awww, you know this picture would make Xtina melt! Er, right?