Eddie Murphy‘s hot young daughters have some ‘splainin’ to do  … because TMZ has learned they hijacked their mom and her fiancé Michael Strahan‘s boudoir for their recent sexy  lingerie shoot.

Photographer Dimitri Ray — who snapped the pics last Thursday — tells us, the girls chose the master bed  inside Nicole Murphy and Strahan’s giant  Bev Hills mansion as the shoot location … presumably because it’s  big and fluffy and … who the hell knows.

We’re told the girls didn’t  consult with mom and Michael — who, we’re guessing, would have chosen a  different location than the spot where they have sex.

FYI, Eddie  and Nicole split in 2006. Nicole and Michael got engaged in 2009.

We’re  told it was 19-year-old Shayne’s first attempt at modeling (not bad) but it’s  old hat for 24-year-old Bria. The photog says the girls wanted to use the shots  to pitch themselves to Victoria’s Secret.

Good luck with that.