Eddie Murphy's Daughters -- Stripped Down in Mom and Future Stepdad's Bedroom

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.