Jessica Simpson may swear by her snake semen drink that she says helps her sing … but at least one expert tells TMZ the truth is even more of a sticky situation.

Here’s the deal … Jessica recently raved to us about her secret specialty Chinese herb cocktail that she says has legit serpent swimmers in it — all at the recommendation of her vocal coach.

Zoologist and “Reptile Royalty” star Jay Brewer tells TMZ … it’s highly unlikely Jessica’s concoction has any actual snake sperm in it … ’cause frankly, it’s not that easy to come by (no pun)!

It seems extracting the fluid is super tough … and even in the largest snakes around the globe, the amount is usually minuscule.

To be clear, Jay ain’t calling Jessica a liar … he just suspects she’s been duped — and the secret ingredient she’s actually consuming is snake oil, AKA nothing special.

That said, Jay said anything is possible … and if JS is really drinking snake semen, the possible benefits would probably be a result of stem cells.

Of course, she isn’t the first celeb to turn to animal sperm for personal gain … Kim Kardashian and Jennifer Aniston both swear by salmon sperm as a route to achieving younger-looking skin.

The whole situation reminds Jay of a tradition done in Southeast Asia where locals put the gall bladder of a snake in their booze and drink it — to bring them luck.

Whether it be a gall bladder for luck or semen for the vocals … Jay tells us it’s all BS in his book … and just a mistreatment of animals.

Paris Hilton‘s not your regular mom, she’s a cool mom — recently jetting off to Hawaii and treating her two precious kiddos, Phoenix and London, to an “unforgettable” trip!

The 44-year-old took to Instagram, posting, “Me and my #Ohana We had such a fun time in Hawaii, playing on the beach and in the waves with my #CutesieCrew was such a special, unforgettable experience.”

She continued, “My heart is so full and I’m so excited for the lifetime of family fun thats ahead of us #Aloha for now Kona!”

Being a mom is another job Paris is “sliving” at, check out this photo of her pushing the stroller while riding her motorized luggage …

Hawaii is a hot spot for the stars … Once you’ve hit the island with Paris, see which other stars love escaping to Hawaii with our gallery above!

D.L. Hughley is ripping Bill Maher for breaking bread with President Trump at the White House … and he says they’re sounding a little too similar these days, at least to his ears.

The comedian joined us on “TMZ Live” Tuesday and we asked him about Bill’s recent visit to the White House, where he sat down for dinner with Trump.

D.L. says Bill is wasting his time if he’s trying to raise an issue with Trump … because he feels POTUS is a purely transactional fella who is only concerned about getting something for himself in anything he does.

It’s a healthy debate … and D.L. also takes some shots at other folks in the Trump Administration.

Catch the full interview today on “TMZ Live.”