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• What caused the death of troubled socialite and heiress Casey Johnson, who was discovered dead in her LA home yesterday? It's too soon to say since toxicology results are pending, although at least one tabloid is suggesting prescription pills may have been involved. In a bizarre twist to the story, Johnson's "fiancée," reality TV star/fame addict Tila Tequila, tweeted last night that Johnson hadn't actually died and was really in a coma, before backtracking a little while later and acknowledging what had already been confirmed by the police. Tequila's also believed to be the last person to have seen the Johnson & Johnson heiress alive. [TMZ, NYP, NYDN]
• It looks like when Beyoncé performed in St. Barts on New Year's Eve, she was doing so at the behest of Hannibal Khadafy, the son of Libyan dictator Moammar Khadafy. This would be the same man who is rumored to have broken his wife's nose last month, was arrested in 2005 for punching her, and was detained by the police in Geneva in 2008 for beating his servants. So either Beyoncé is really hard up for cash (which is doubtful), or she needs someone to vet her public appearances going forward. [P6]
• The third White House state dinner crasher has been identified. His name is Carlos Allen and he's a DC-based party promoter, and he managed to sneak into the White House by hopping on a bus filled with Indian diplomats. [WP]
• Susan Sarandon has denied reports that she's involved with Jonathan Bricklin, her partner in SPiN, the ping pong club on the East Side. But a source close to the 31-year-old entrepreneur says Bricklin and Sarandon spent New Year's together and were very "touch-feely." [Fox411]

• Why does Jeremy Piven have a giant scar on the back of his head? It's a pretty good sign he had a hair transplant, although Piven is claiming it's because he had a "scar-minimizing procedure" following a theater-related injury he sustained years ago. [TMZ]
• In what must be the most low-key, truly secret celeb wedding in ages, Vince Vaughn tied the knot with real estate agent Kyla Weber in a Chicago suburb on Saturday. [Us, People]
• Tiger Woods appears shirtless, in a skull cap, and pumping iron on the cover of Vanity Fair's February issue. The photo, along with six other images inside the mag, were taken by Annie Leibovitz four years ago, but she sold them to the mag after the Woods scandal broke. Let's hope the sale helped Annie out with the $24 million debt she has hanging over her head. [P6, NYDN]
• In other Tiger-related news, someone is shopping around a sex tape of he star golfer, which was supposedly filmed two years ago; Tiger's estranged wife, Elin Nordegren, has returned to Florida from her trip to the French Alps; and a new report suggests Tiger is currently holed up at a friend's estate in Africa. [TMZ, Us, TMZ]
• An overzealous airline agent booted Joan Rivers off a flight from Costa Rica to New York on Sunday because Rivers' passport said her name was "Joan Rosenberg AKA Joan Rivers." (Rosenberg is her late husband's last name.) Let it be known, however, that Rivers is not, at least as far as anyone knows, a threat to national security. [NYDN, P6]
• Rihanna has a new man, and it's LA Dodger Matt Kemp. They reportedly spent New Year's together in Dubai and have since been photographed making out in Mexico. [TMZ, Sun, ShowbizSpy]
• Entourage's Adrian Grenier got pelted with a cocktail while playing with his band, the Honey Brothers, in Atlantic City over the weekend. Don't worry, he's fine, although he's still playing music, unfortunately. [NYDN]
• Is Heroes' Hayden Panettiere dating a Ukrainian heavyweight boxer named Wladimir Klitschko, who is 13 years older and a foot taller than her? It seems so! [Sun, JustJared]
• How does Rosie O'Donnell feel about her new relationship with Tracy Kachtick-Anders? She called it "delicious" and confirmed that the two have already had playdates for their collective 10 children. [MSNBC]
• Brooke Mueller intends to reconcile with Charlie Sheen, although the two haven't spoken since his arrest in Aspen on Christmas Day when he threatened to kill her. Sheen also returned to the set of Two and a Half Men yesterday, in case you happen to care. [NYP, People]
• Another "report" has come out suggesting that Tom Cruise and Katie Holmes are planning to have baby number two. [ShowbizSpy]
• Lady Gaga has died her hair the color of French's mustard. Or Sponge Bob. Take your pick. [3am]
• If you're wondering why the new voice introducing Katie Couric on the CBS Evening News sounds familiar, it's because it is. It's Morgan Freeman, who recently re-recorded Walter Cronkite's intro. [MSNBC]
• Leona Lewis was bucked off a horse last week and had to walk with crutches. But she's doing fine now, so don't you worry. [P6]
• The whole Kanye West backlash clearly hasn't damaged West's ego, you'll be happy to hear. He blogged on Monday that he plans to continue to bring people "the best he has to offer" because "true poets get better" over time. [People]
• No-BS publicist Kelly Cutrone's new reality show on Bravo, Kell on Earth, debuts next month. Just in case you're setting your DVR or whatever. [NYDN]
• Leighton Meester is just as obsessed with Jersey Shore as the rest of America. She told a reporter she'd love to be a psychiatrist to "look into that cast's brains." Then she added: "Although it might lower my IQ a little bit." Brace yourself for a Snooki/Blair Waldorf throwdown. [NYDN]
• In other Jersey Shore news, Pauly D gave Michael Cera a makeover—complete with spiked hair and excessive hair gel—for promos for Cera's upcoming movie, Youth in Revolt. [Us]
• Which older, overweight celeb (who, strangely enough, looks a lot like Van Morrison) took a photo of himself with 50 Cent and a gun and then emailed it out to all his friends? Why, Val Kilmer, of course! [NYDN]
• The new cast of the Celebrity Apprentice has been released, and it includes Sharon Osbourne, Cyndi Lauper, Bret Michaels, Selita Ebanks, and Rod Blagojevich, among others. [People, Us]
• Britney Spears rocks a full face of makeup at the gym, and it sometimes makes her look like "the Joker." Sad face. [P6]