Jessica Biel's little brother is slamming Justin Timberlake's 901 Tequila company -- claiming the brand is a massive failure and JT is to blame.

Justin Biel -- who we're told worked for the 901 brand until a few weeks ago -- just posted a couple of videos to his Facebook page ... in which he claims Timberlake sabotaged the company by refusing to promote his own liquor.   

Biel rants, "I've been waiting for [Timberlake] to do something with this f**king brand -- make a song about it, put it in a god damn video, hold it up, take some pictures, I don't care -- just do something because we're dying on the motherf**king vine here!"

Biel -- seemingly bitter with the brand -- sarcastically launches into a series of new "angles" he thinks could help sales ... claiming among other things:

-- "901 Tequila ... mixes well with a bump of cocaine"
-- "901 Tequila ... Steve Jobs used to drink it ... oh man that's too soon."
-- "901 Tequila ... I only s**t my pants once on it."
-- "901 Tequila ... so god damn exclusive our own CEO doesn't even drink it."

Biel continues, "Sales dropped drastically from last year ... way to go sales team!  Our distribution partners still couldn't give two f**ks about the brand, repping Patron all the way, and giving us the ol' fist up the ass."

Sources connected to Biel and Timberlake tell us Jessica's brother left the company on good terms ... even though it doesn't appear that way in the videos.

A rep for 901 tells TMZ ... "Justin Biel’s video was intended to be one in a series of videos created by 901 Tequila employees (including the brand owner) as part of a larger viral marketing campaign slated for the end of December. It was released prematurely without our knowledge and prior to the final edit.”

You buyin' it?


11:37 PM PST -- Justin posted a statement on his Facebook page saying, "For all you knuckleheads that haven't figured it out. This is just a joke. hahah. Got ya."

The statement contradicts the 901 rep ... who insisted the videos were not a "joke" -- but a key part of a large viral marketing campaign that was released without permission of the company.

Justin Timberlake is a man of his word -- he attended last night's Marine Corps ball in Richmond, VA with Cpl. Kelsey De Santis as promised.

The wife of one of the Marines in attendance snapped this pic of JT inside and sent it to WTVR. She said Justin seemed like a normal guy and posed for pics with several guests.

JT famously agreed to go after Cpl. De Santis invited him via YouTube.

Not only is it back on, but it must be getting serious again because Justin Timberlake had dinner at Angelini Osteria in L.A. last night with Jessica Biel ... and his parents.

Despite breaking up earlier this year, JT & Jess' relationship is so hot that parental guidance is suggested.

Justin Timberlake is such a fine piece of man -- ladies even get hot and bothered over his GOLF swing. No wonder Jessica Biel's on him like a tight, sexy pair of golf pants.

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Justin Timberlake swears the penis picture found on Mila Kunis' cell phone by hackers is NOT his -- so it's time to play ... WHOSE ... PENIS ... IS IT???

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Justin Timberlake wants to make it clear -- the explicit picture on Mila Kunis' cell phone -- showing a penis -- is NOT J.T. -- this according to a source close to Justin.

TMZ broke the story ... Mila's cell phone was hacked, and two of the pics the hackers seized showed Justin -- one laying in bed, the other showing Justin with a pair of pink panties over his head.

There is another pic of a penis but that's it -- there's no torso, no face ... and Justin has made it clear to people close to him -- he NEVER sent such a pic to Mila or to anyone for that matter.

Mila Kunis is the latest celebrity whose cell phone has been hacked, and the hacker is leaking several pictures of a seductive Justin Timberlake ... TMZ has learned.

Four pictures have been leaked, including two which show Justin -- one, laying shirtless in a bed, and another in which J.T. is jokingly sporting a pair of pink panties over his head.  Kunis is not featured in either of the pics.

There's another photo of Mila in a bathtub, but all you see is her head.  And then there's another photo of a male which is explicit in nature, although his identity is a mystery.

There are also some texts and the hacker claims they reveal exchanges between Justin and Mila.

As we first reported, we're told Scarlett Johansson is going to the FBI today after nude photos of her that were hacked from her cell phone were published this morning.

We could not reach Kunis for comment.

Justin Timberlake was among the thousands of fans amazed by the sick semi-final tennis match between Roger Federer and Novak Djokovic today at the US Open.

Djokovic prevailed 6-7, 4-6, 6-3, 6-2, 7-5.

Justin Timberlake took a break from movies ... and "SNL" ... and relationship drama -- and finally got back to music last night!!!!!

JT rolled over to his Southern Hospitality restaurant in NYC -- grabbed the mic and put on an impromptu show while tons of crazy fans went nuts ... including Mr. and Mrs. Kim Kardashian.

Timberlake performed with the band FreeSol ... mostly playing the keyboard while the band rocked out some stuff from their new album -- though he did grab a guitar at one point and knocked out a pretty awesome rendition of "What Goes Around ... Comes Around." 

Despite breaking up earlier this year, former couple Jessica Biel and Justin Timberlake reunited for a platonic afternoon bike ride in Toronto on Monday.

They're friends with exercise benefits.

Here's "Twilight" muscle hunk Kellan Lutz at an event in the Hamptons this weekend (left) -- and former 'NSYNC lead singer Justin Timberlake back in 2000 (right).



One said bye, bye, bye to their look.

We're just sayin'.