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Britney's ex, Kevin Federline, and her fiance, Jason Trawick, were apparently trained to do grocery shopping ... we've gotta hand it to Brit for getting these guys to participate in domestic duties!

Meanwhile, KFed's got other dooties to deal with. He's got a year-old baby with girlfriend Victoria Prince.

Perhaps the question is ... which couple will beat the other to the wedding chapel? Jason and Britney are engaged, but recent reports claim their engagement is on the rocks and Brit may be having second thoughts.

Spears is busy taping American Idol and after not working for so many years, perhaps the stress of her hectic show schedule is getting to her?

As for Federline, he hasn't even popped the question to Prince. Better get a move on, KFed!