Yesterday Demi Moore's 911 call hit the internet, and friends of the 49-year-old actress told dispatchers that she had collapsed after smoking a mysterious substance.

An unidentified female caller revealed that it was "not marijuana," adding that it was "similar to incense." Demi had difficulty speaking, convulsions and a fever, and now doctors are speculating that she may have smoked synthetic cannabis, also known as "K2," "Spice" or "herbal incense."

Dr. John Sharp, MD, a faculty member of Harvard Medical School explained to Us Weekly that the drug is similar to marijuana but "not necessarily safer" and it doesn't show up in most drug screenings. Some medical studies have linked the use of synthetic cannabis to psychosis, heart attacks and convulsions, so Demi's reaction does seem consistent with someone using the drug.

And that (along with nitrous oxide) weren't the only substances Demi was allegedly using. Prior to her trip to the ER, Demi had been drinking excessive amounts of Red Bull energy drinks, and a source told Us that she drank 12 cans in one evening!

Brett Ratner is reportedly interested in making a movie that would show "the real" Michael Jackson, and he recently met with Frank Cascio, author of “My Friend Michael" and a longtime pal of the late King of Pop.

Cascio reportedly met Jackson in 1984 and became his assistant and eventually his manager, and his book documents the singer's highs and lows, including child molestation charges and prescription drug use. Ratner was also friends with Jackson, and a source close to the director tells NY Daily News that he has toyed around with the idea of making biopic on the singer for a while. At the time of Jackson's death, Ratner told the LA Times that he “was the most inspirational person in my life ... When you were with him, you really felt like God was within him.” Hmm...

In other news, the teaser for the special MJ tribute episode of Glee has hit the web, and it features Darren Criss covering Jackson's hit, "Wanna Be Startin' Something". Click thru to watch!

Denise Truscello/WireImage

She's still rocking hair the color of Smurfette's skin, but it doesn't look like newly single Katy Perry is singing the blues!

Last night the pop star co-hosted the GiveLove charity event with J. Molinari Jewelry designers Markus Molinari and Jason Arasheben at the grand opening of 1 OAK Las Vegas at The Mirage, and she looked absolutely amazing on the red carpet. The "The One That Got Away" singer been laying low since the news broke in late December that she was splitting from husband Russell Brand, so it's good to see her back out and about.

Katy and Marcus presented a check for $50,000 to GiveLove's co-founders, Patricia Arquette and Rosetta Getty, and other guests at the bash included Paris and Nicky Hilton, Scott Disick, Chris Evans, David Arquette, Christina Milian and Shenae Grimes. Sounds like a blast!

Charlie Sheen shot a Direct TV commercial in Los Angeles yesterday, and the actor appeared to be in great spirits when he took a quick smoke break.

Sheen chatted briefly with photogs, and he revealed that he's rocking a bathrobe because he's going to be in a jacuzzi for the video spot. Hmm, wonder if there's going to be any goddesses in there with him?

Rebecca Gayheart and daughter Billie Beatrice went to their fav park in Beverly Hills yesterday, and it looks like the ladies had a blast soaking up the unusually warm January weather.

Rebecca's newborn baby girl Georgia Geraldine wasn't present (she was born just 4 weeks ago!), but we have a feeling we'll get our first peek at the tiny tot sometime in the near future...

Alex Rodriguez and girlfriend Torrie Wilson partied it up in Miami the other night, but when it was time to head home, the Yankees star pulled a Leonardo and walked several strides ahead of her. Aww, no pictures together?

While Torrie is a bit more muscular than most gals out there (she is a retired professional wrestler), she's definitely a hottie, so we're not sure why A-Rod is so camera shy about the whole thing!

Yesterday Kourtney Kardashian went shopping in Beverly Hills, and the starlet covered up her barely-there baby bump with several shopping bags. Since it's been all about Kim and Khloe lately, we almost forgot Mason's mommy was pregnant with baby number two!

Before her retail therapy session, Kourt squeezed in some time with Kim, and later in the day the sisters tweeted at each other about 911 calls hitting the web, presumably in response to the one which resulted in Demi Moore's hospitalization.

Kim wrote, "Is it disturbing 2 anyone else that 911 calls can be released 2 the public?I think its so private &should only be allowed in court if needed." Kourt retweeted it and added, "Its horrifying and disgusting!" Wait, so leaked 911 calls are "disgusting" but hearing about her leaky oil enema isn't? Just sayin'!

Yesterday Rihanna was spotted out and about in Beverly Hills, and instead of going bra-less and showing off her new ink, the R&B hottie covered up in a hoodie and a hat and tried to keep a relatively low profile.

Rihanna recently got "THUG LIFE" tattooed on her knuckles, and it seems like she's stirred up quite a bit of controversy! After receiving a handful of messages from folks on Twitter, RiRi began defending her latest tat with a series of tweets. "Err'body has an opinion, but yall know what yall can do with them!!! #THUGLIFE," she wrote, adding, "I'm thinking I shoulda got a tear drop instead!!! #THUGLIFE maybe next time." Ha!

And what did she say in response to the follower who said, "@Rihanna lol you're not a thug, stop it"? Click thru to find out!