Actor Patrick Swayze has died. He was 57. Patrick passed away on Monday in Los Angeles surrounded by family. The actor had been battling pancreatic cancer since being diagnosed in early 2008. Determined to fight his illness, Patrick resolutely continued working on his A&E series "The Beast" throughout his cancer treatments and also spent as much time as he could with wife of 34 years Lisa Niemi and their family.

Sylvester Stallone walked the red carpet at the 66th Venice Film Festival on Saturday night to pick up a prestigious award. Read on to find out the details… The 'Rocky' and 'Rambo' film icon was there to receive the Jaeger-LeCoultre Glory to the Filmmaker Award. Stallone also showed clips of his latest film, 'The Expendables', in which he co-stars opposite Mickey Rourke, Jason Statham and Jet Li (Bruce Willis and Arnold Schwarzenegger also appear in the film), and screened a new director's cut of his 2008 film 'Rambo.'

Talk show host David Letterman attended the opening ceremony Monday of a new heart center in New York City. Former patient Letterman was on hand at the unveiling of the Ron O. Perelman Heart Institute of New York-Presbyterian Hospital/Weill Cornell Medical Center, and spoke of the medical facility fondly. "When I’m here, I see a lot of people I know, a lot of people that, because of their efforts, I’m still living -- if you can call a steady diet of oat bran and egg whites living," he joked, and then continued in seriousness, "It's fun to be back here and this is a tremendous facility."

Neil Patrick Harris talks about having a baby with his partner, Broadway actor David Burtka. In a revealing interview with New York Magazine, the "How I Met Your Mother" star frankly addresses being the most successful openly gay actor today. When asked about being what the mag calls "the Great Gay Hope," showing that crossover appeal is possible, Neil finds it "weird," saying, "I appreciate that. But it feels weird to own that."

ET has the latest... Teri Hatcher and Jeremy Piven showed off their athletic skills in Malibu for charity! The "Desperate Housewives" and "Entourage" stars participated in the Nautica Malibu Triathalon over the weekend where both of the actors took home medals.

After more than ten years of being separated from his estranged wife, Playboy mogul Hugh Hefner says he waited to complete his divorce "because of the children." "Now is the time," Hefner told the Associated Press of making his divorce final to former Playmate of the Year, Kimberly Conrad Hefner. Hefner's twin boys are now about to turn 18. "I stayed married not because it was a marriage -- the marriage ended in 1998," Hefner told AP. "I stayed because she wanted me to."

Singing sensation Susan Boyle has made her way across the pond and into the showbiz city of Los Angeles, California! The "Britain's Got Talent" runner-up was the focus of many media outlets as she arrived to sunny L.A. Boyle will reportedly be appearing on "America's Got Talent," which films in L.A.

Actor Colin Farrell reportedly has a baby on the way! Farrell, 33, confirmed to Us magazine that he and girlfriend Alicja Bachleda, 26, will be welcoming their first child together. Farrell already has a 5-year-old son, James, with model Kim Bordenave.

Alana Stewart celebrated My Journey with Farrah, her intimate account about her late best friend Farrah Fawcett, with a book party in L.A. on Friday night. There, she opened up to ET about the emotional memories that writing the book brought back for her, communicating with Farrah through medium James Van Praagh, and much more. Click the video for Alana's heartfelt recollections about Farrah’s life and courageous battle with cancer, plus her reaction to their documentary "Farrah's Story" being nominated for an Emmy.  A portion of the proceeds from My Journey With Farrah will go to the Farrah Fawcett Foundation to support cancer research. The book is in stores now.

Which celebs made big headlines this week? Click the pictures for all the key, star happenings through Friday!