Lindsay Lohan took this whole posing for Playboy thing very seriously! According to TMZ, the “actress” is baring all in her upcoming spread, and that includes full frontal nudity.

As we previously reported, Lindsay recently locked down a nearly-million-dollar deal with PB for a full pictorial — and yesterday, she finally wrapped her 4-day shoot.

Reports circulated Lindsay would pull one of those lame semi-nude fiascos — all sideboob, no fun — but sources close to Hef & co. tell us, that is NOT the case. Lindsay did insist the photos be “tastefully done,” but we’re told she’s still going the full monty.

It’s unclear when Lindsay will grace the cover — but it could be the life-giving jolt Playboy needs for a comeback.

I’m not surprised in any way… what else does Lindsay have left to do? Reality TV… that’s it. Once she sinks so low as to do reality TV, we know it’s over.

PIC (INF): Exlusive picture of Lindsay taking a break from her community service at LA County Morgue this morning.