2:25 PM PT -- Jenny deleted the post from her Instagram. Guess it wasn't intentional, after all.
Jason Biggs and his wife got photobombed ... by deez. Deez who, you say?
Yes, Jason's family jewels were exposed when Jenny Mollen cleverly snapped a selfie of herself in the mirror -- and Jason squatting on a toilet.
Seems clear they planned out the shot for laughs ... Jenny captioned the pic, "Is this a cute sweater?" What's unclear is if the "American Pie" star's sack reveal was intentional.
For some reason these lyrics come to mind -- "Swing low, sweet chariot ... "