When Whitney Houston died, a little bit of Ray J went with her -- well, Ray J's clothing anyway ... and now he's being sued for the expensive items that mysteriously disappeared from room 434 at the Beverly Hilton.

In recently filed legal docs, L.A. Stylist Marc Littlejohn claims he was hired to do Ray J's wardrobe styling on February 10 for a Grammy related event ... problem is, he alleges all the duds he let the singer borrow were left in Whitney Houston's room.

Houston died the next day in that room and, according to the lawsuit ... the pricey clothes haven't been seen since.

Now Littlejohn is suing Ray J for $2,880 -- the cost of the missing clothes -- insisting he's reached out to both the singer and his mother/manager repeatedly to get some cash or the threads.

So far, he has neither.

Ray J seemed in good health as he and a pal did a little shopping in Beverly Hills yesterday afternoon ... just a few days after he was hospitalized in Las Vegas. 

As TMZ first reported, Ray J was taken to the hospital the morning after the Billboard Awards after suffering from a combination of exhaustion and dehydration. It was Sophie Monk, who endorses an ingrown hair removal product with Ray J, who discovered him in his hotel room and called 911.

There are worse people to owe a debt of thanks to.

Ray J owes his life to ingrown hairs -- because TMZ has learned, the person who called an ambulance for him Monday morning is none other than model Sophie Monk, his ingrown hair endorsement partner.

As we reported, Ray was rushed to the hospital Monday morning for exhaustion and dehydration following the Billboard Music Awards -- and we're told Sophie's the one who discovered him in his hotel room and alerted authorities.

Sophie and Ray J had hosted a Billboard Awards afterparty the night before -- promoting their Prince Reigns ingrown hair shaving serum -- and after they returned to their hotel, we're told Sophie had a bad feeling Ray wasn't okay.

According to sources, the two went to their separate rooms -- but Sophie decided to check up on Ray to make sure he was alright ... and discovered him unresponsive on the floor.

We're told Sophie called hotel management, which then called 911. An ambulance took Ray J to the hospital shortly after.

Ray J crashed and burned the morning after the Billboard Music Awards ... and landed in the hospital ... TMZ has learned.

We're told Ray J was extremely upset after his confrontation with Whitney Houston's family -- notably Pat Houston -- during the awards ceremony. On Monday morning, someone went into Ray J's hotel room and realized the singer was "out of it" and couldn't get out of bed.

We're told Ray J was extremely disoriented and was immediately taken to the hospital by ambulance.

As for what happened ... it's looking like a combo of exhaustion and dehydration. Ray J had just returned from a quick, 32-hour round trip to China for business and when he landed he immediately drove 4 hours to Las Vegas for the awards show.

Ray J is still in the hospital. No word on when he'll be released.

Ray J was almost physically removed from the Billboard Music Awards last night after angry members of Whitney Houston's family ordered their security to get him away from them ... TMZ has learned.

Pat Houston's blood was boiling because she, Bobbi Kristina and other family members were seated next to Ray J, the person Pat believes was a very bad influence on Whitney. Minutes before the tribute to Whitney, Pat asked her security to remove Ray J from his seat, but he refused to budge.

Our sources say ... Pat's security summoned hotel security, along with several uniformed officers to physically remove Ray J. 

Just before push was about to come to shove, security warned Pat that things would likely get physical and it would almost certainly be caught on video, just as Whitney was about to be honored.  Sources say Pat then grudgingly recanted and Ray J kept his seat.

For his part, Ray J groused to friends, "Pat ruined what was a great opportunity to honor the woman who I loved."



11:40 AM PDT -- A rep for the Houston family tells TMZ ... Pat's assistant DID ask for Ray J to be moved from his seat ... but only after an official from Billboard told the family they needed to move to the seat that Ray J was already using.

Since Ray J had a ticket with the proper seat number, he refused to budge ... so Pat's assistant called for security to help sort out the situation.

The Houston family rep insists Pat does not have a problem with Ray J.

The death of Whitney Houston hasn't diminished the marketing value of her ex-boyfriend Ray J -- TMZ has learned the singer just inked a major deal ... to fight the war on ingrown hairs.

Ray J is officially the new face of Prince Reigns shaving serum ... and according to the singer's rep, the deal is worth up to $1 million bucks ... though the rep wouldn't divulge the exact terms of the contract.

A rep for the company tells us Sophie Monk signed a similar deal.

Fun Fact -- Ray's former sex tape partner Kim Kardashian has also dabbled in the body hair removal business -- inking a deal of her own with the TRIA laser hair removal system a few years ago.

We said it was a "fun" fact ... not an interesting fact.

Ray J is taking a 5-figure beating in court -- because a judge has ordered the singer to pay more than $26,000 ... after allegedly blowing off a radio appearance in South Carolina back in 2010.

The SC station -- called Cox Radio -- originally sued Ray J, claiming it paid him $20,000 to MC at a local event for a couple hours ... then attend a meet-and-greet with fans for another 30 minutes.

But according to the lawsuit, Ray blew the entire thing off -- and absconded with the money.

A South Carolina judge ruled in favor of Cox radio because Ray never showed up, awarding it $25,100 -- but Ray didn't pay, so Cox took the judgment to Ray's primary state of residence ... California.

The judgment has since swelled to $26,848.33. So far, no word back from Ray.

Ray J is pissed that people are accusing him of being Whitney's enabler and, even worse, fueling her with the fatal dose of cocaine.

Ray J's rep tells TMZ ... the singer had NO KNOWLEDGE that Whitney was using again.

The rep says Ray J is especially upset at claims made by Bobby Brown's sister, Leolah Brown, who went on TV Thursday night and suggested Ray J was to blame for Whitney's demise.  Ray J says the claim is absolute B.S.

Ray J is adamant ... he is NOT secretly harboring a stash of sexually explicit photos and video, depicting him and Whitney Houston in the throes of passion -- because no such stash exists.

There have been reports ... Ray is sitting on a hoard of sex tapes and XXX photos -- holding them over the Houston family as ransom -- because he knows they're worth a pretty penny.

But Ray J's rep tells TMZ, "The despicable tabloid report released today claiming the existence of a sex tape between Ray J and Whitney Houston is not true ... There is no sex tape."

Sources extremely close to Ray J tell us the singer insists he NEVER took sexually explicit pics of Whitney ... or recorded ANY of their intimate encounters.

Without mentioning her by name, Ray J told reporters yesterday he is "still hurting" from the death of Whitney Houston and that he's been having a "tough time" since she passed. 

Ray J was at an event to support the Brotherhood Crusade and Mothers in Action Organizations ... and he knew the increased media presence was there because of his relationship with Houston.

So he decided to address the issue without being asked, telling reporters, "I really miss my friend, you know, I really do. I’m still hurting."

Ray J said he still keeps a picture of Whitney on his phone and looking at it helps him through the day.

Houston passed away on February 11. She was 48.

With his famous older sister Brandy by his side, a somber Ray J walked through LAX moments ago to board a plane bound for Whitney Houston's "Home Going" ceremony in New Jersey.

The siblings strolled quietly through the airport along with their mother. At one point, Brandy put her arm around Ray J as photogs fired off question after question about his relationship with Houston.

Earlier today, Ray J released a statement about Whitney ... saying her smile will "live in my heart forever."