Police are investigating Whitney Houston's death at the Beverly Hilton Hotel; at 3:55pm PT Saturday, the singer was pronounced dead in a fourth-floor hotel room, with no immediately apparent cause of death.

There were "no obvious signs of criminal intent," Beverly Hills Police Department Lt Mark Rosen said today at a press conference.

Rosen said Houston's body would lie in situ and that the coroner's office would eventually take over the investigation.

When asked if drugs were found in the room, Lt Rosen said the investigation was "too fresh" and that there could be no speculation on the cause of death. Reporters were told the individuals who called 911 were part of the singer's "entourage."

As Hollywood and the world mourn the death of Whitney Houston, celebs like Mariah Carey and Christina Aguilera are expressing their sorrow online.

Houston, 48, died in a hotel room at the Beverly Hilton -- the cause of death not yet revealed.

Here's how the stars reacted to the news:

"We have lost another legend. Love and prayers to Whitney's family. She will be missed." - Christina Aguilera

"She will never be forgotten as one of the greatest voices to ever grace the earth." - Mariah Carey

"So devastating. We will always love you Whitney, R.I.P." - Katy Perry

"No words! Just tears #DearWhitney" - Rihanna

"I am devastated. I am absolutely devastated at the news about Whitney Houston. Such a tragic, tragic loss." - Paula Abdul

"I found my voice singing Whitney Houston's music. Today I lost my idol." - Jessica Simpson

"Just heard the tragic news that Whitney Houston passed away. I pray for her daughter & loved ones. We will always love you Whitney." - Kim Kardashian

"just heard the news. so crazy. One of the GREATEST VOICES EVER just passed. RIP Whitney Houston. My prayers go out to her friends and family." - Justin Bieber

"She's paved the way for every single singer in the music industry. Iconic, legendary, innovating, amazing, humble...1 the best in the world" - LA Reid

"RIP Whitney" - Adam Lambert

"R.I.P. Whitney Houston, really can't believe this" - Russell Simmons

"So so sad that Whitney Houston died...praying for her daughter and her family...tragic..just heartbreaking..amazing talent, amazing voice.." - Kris Jenner

Grammy-winning singer Whitney Houston died Saturday afternoon, her rep has confirmed.

The chart-topping artist is survived by her 18-year-old daughter Bobbi Kristina and her ex-husband Bobby Brown.

No cause of death has yet been released.

The singer was found on the floor of her hotel room at the Beverly Hilton Hotel where Houston's mentor Clive Davis' annual pre-Grammy party is to be held tonight. Several friends and colleagues tried to revive her, to no avail. CNN is reporting the Houston's bodyguard "Ray," was the one who found her. A spokesperson for the police department said at a press conference outside the hotel that an investigation is ongoing and as of 6pm PT, Houston's body is still inside the 4th-floor hotel room.

Unconfirmed reports place Houston's sometime-boyfriend Ray-J (Brandy's younger brother and Kim Kardashian's ex-boyfriend and sex tape partner) in the hotel room. CNN says Ray-J's rep denies the R&B singer was with Whitney when she died. It seems the confusion was that the singer's bodyguard is also named Ray.

Houston was the most-awarded female artist of all time. She sold over 200 million albums, won six Grammys, two Emmys and so many more.

Whitney started singing in her church choir in Newark, NJ -- the daughter of gospel singer Cissy Houston. She was discovered by Clive Davis when she performed at a New York nightclub.

Houston crossed over from music to the big screen, with her roles in The Bodyguard and Waiting to Exhale. Whitney had just wrapped filming on Sparkle -- a remake of the 1976 film loosely based on the Supremes.

Houston entered an out-patient drug and alcohol treatment program in May 2009. The singer had admitted her struggles with substance abuse to Diane Sawyer in a 2002 interview.

Jennifer Lopez/Glowing

She may be 42 years old, but she's still got the body for it!

Jennifer Lopez is launching her 18th fragrance (yes, really!) and the actress/singer stripped off her clothes and got all oiled up for this sexy promo shot.

Lopez tells WWD, "Glowing is such a clean fragrance. That's what I've always been about...At the essence, it's still natural, earthy, clean and real, but a little different side of that. It's the woodsy side of it, which I think is kind of New York-y, darker and sexier."

She may be posing naked, but don't accuse her of being a media hungry celeb! Lopez also reveals that she feels the burn from entertainment news shows and gossip sites. "It's hard sometimes, I'm not going to lie," she says. "I try to stay away from the media as much as I can. Sometimes. I try not to take it too personally, because I don't think they do it just to me. But as a human being it feels like that. You feel like you're the only one being picked on. But the truth is, they pick on everybody. They really don't discriminate. I try to concentrate on all the great things I have going on in my life."

Hmm, like her 24-year-old boyfriend? We kid, we kid!

Jesse Metcalfe and fiancee Cara Santana got all dolled up for a dinner date Crustacean in Beverly Hills the other night, and even though they've been together for nearly 5 years, it looks like they still have that spark!

The lovebirds announced their engagement last month, and they've reportedly been living together for the past 3 years, so we're thinking there might be a wedding on the horizon for them in 2012!

Courtney Stodden recently filmed a sexy video in hopes of becoming the next spokesmodel for FreeCreditScore.com, but alas, she didn't make the cut.

The 17-year-old aspiring starlet has a few theories as to why the company passed on her clip, telling Radar, "Even though my commercial went viral internationally and was the most popular, I am apparently too dang sexy for FreeCreditScore.com."

In the commercial, two young men are fishing by the beach, and after reeling in what they hope to be a big fish, Courtney (dressed as a mermaid, natch) emerges from the sea. Courtney shakes the water off her body and giggles, "OMG. I'm so…wet."

FreeCreditScore.com said in a statement that they "did not hire, approve, or compensate Ms. Stodden or her production team for an advertisement or to represent the brand in any fashion." A rep for the website added, "[Courtney] and a production team were among dozens of creative producers who responded on spec to a posting on Poptent.com, a crowdsourced video production service, where brands and agencies post specific video assignments to generate creative concepts for review and consideration by a brand. Poptent's participation guidelines specifically state that any and all work product must first be selected, reviewed, and approved by the client brand or agency before it can be commercially shared or distributed. Such review and approval from Poptent.com or FreeCreditScore.com never occurred." Burn!

Looks like she wasn't visiting mom Demi Moore in rehab after all!

Rumer Willis was snapped at the Roissy-Charles de Gaulle airport in Paris, France yesterday, and after that the 23-year-old starlet continued on to Germany. "Munich is beautiful but absolutely freezing don't know how they do it," she tweeted.

Speaking of tweeting, Rumer hadn't updated her Twitter page at all since Demi was hospitalized late last month, so it seems like she's finally gotten over the shock of her mother's meltdown. While there have been reports that Demi is holed up at Cirque Lodge in Utah, a source told TMZ last week that the 49-year-old actress was NOT seeking treatment there, but it's still not known where she is.

A matchy matchy Reese Witherspoon was spotted at a newsstand in Brentwood on Friday, and the Oscar winner happily smiled for photographers before snapping up a few magazines.

So what did she buy? Redbook and Town and Country, of course. She may be the object of Tom Hardy and Chris Pine's affection in This Means War, but offscreen she's a total soccer mom!