DEAD AT 21  —  “Buckwild” Star Shain Gandee was found dead in a vehicle in West Virginia this morning ... 31 hours after the 21-year-old MTV reality star had been reported missing, this according to law enforcement.  —  According to officials, Gandee and 2 other people were discovered in the vehicle in Sissonville, West Virginia.

Cory Monteith Checks Into Rehab  —  Actor Cory Monteith, who stars as Finn Hudson on the Fox series Glee, has checked into rehab, PEOPLE has learned exclusively.  —  The actor “has voluntarily admitted himself to a treatment facility for substance addiction,” his rep tells PEOPLE.

Lindsay Lohan's Plea Deal — One String Attached ... I WANT MY ADDERALL  —  LINDSAY LOHAN'S PLEA DEAL  —  One String Attached ...  I WANT MY ADDERALL  —  EXCLUSIVE  —  Lindsay Lohan drew a line in the sand during plea negotiations in her lying-to-cops case — she'd agree to rehab …

Ryan Gosling gets into dust-up with photographer who calls Eva Mendes “baby”  —  Don't mess with Ryan Gosling's girlfriend, Eva Mendes.  We're told the pair, in town for the premiere of their new movie, “The Place Beyond the Pines,” were at the Bowery Hotel Friday when a fashion photographer …

'Walking Dead's' David Morrissey Returning as Series Regular in Season 4  —  The British actor initially signed on for one season and will be back as the Governor on the zombie drama.  —  “The Walking Dead's” David Morrissey  —  [Warning: This story contains spoilers from Sunday's season three finale of AMC's The Walking Dead.]

NEWS/Mekhi Phifer Says “I Do” to Reshelet Barnes!  —  Mekhi Phifer is a married man!  —  The actor, best known for playing Dr. Greg Pratt on ER, said “I do” to Reshelet Barnes on Saturday in Beverly Hills, Calif., at the Montage Hotel, E! News reports.  —  The couple made it official …

Rachel Bilson Is Our May Cover Girl!  —  We're so excited to have Hart of Dixie star, style icon, and the girl who will forever be Summer Roberts in our hearts—Rachel Bilson—on the cover this month.  Check out some of our favorite photos from the shoot, along with behind-the-scenes scoop and video …

So Hayden Panettiere definitely has implants  —  Hayden Panettiere showing off her breast implants in Miami (3/31)  —  Remember the rumor from back in 2010 that Hayden Panettiere allegedly got a boob job, going from an A cup to a C cup?  Well, judging by these pics of her yesterday in Miami …

EDITOR'S PICKS  —  With the premiere of “Mad Men's” penultimate season next Sunday, fans of the AMC drama will undoubtedly enjoy watching the travails of Jon Hamm's Don Draper, Elisabeth Moss' Peggy Olsen, Christina Hendricks' Joan Harris and more, but astute watchers will notice something's changed.

PICS: Hayden Panettiere Rocks Hot Pink Bikini After Wladimir Klitschko Engagement  —  Hayden Panettiere may not feel comfortable rocking her engagement ring just yet, she she had no qualms about showing off her bangin' bikini body in Miami March 31!  The Golden Globe-nominated Nashville actress flaunted …