A few entertainment headlines on my radar this morning...

In the wake of her incoherent, seemingly drunken performance in Belgrade over the weekend, Amy Winehouse has now canceled her entire 12-city tour. Yesterday, it appeared she would skip just two gigs, but Winehouse’s management issued a statement Tuesday that called the whole thing off. “Despite feeling sure that she wanted to fulfill these commitments, she has agreed with management that she cannot perform to the best of her ability and will return home,” the statement read. Presumably another trip to rehab is imminent. (People)

Penn Badgley, the man who will play revered singer-songwriter Jeff Buckley. (Brian Snyder/Reuters)

Penn Badgley of “Gossip Girl” will play Jeff Buckley in abiopic about the singer’s life, “Greetings from Tim Buckley.” (The film will focus on what happens during the days prior to Jeff’s appearance at a tribute concert to his father, Tim. Hence the movie’s name.) The resemblance is definitely there. But is the gravitas? (Update: This Buckley project is different from the one that will be produced by Buckley’s mom, Mary Guibert. An actor has not been cast in the lead yet for that project.) (The Hollywood Reporter)

Paris Hilton and boyfriend Cy Waits have broken up. I know, I know — the news is a painful shock for all of us. (Us Magazine)

The first-ever Critics’ Choice Television Awards rewards “Mad Men,” Jon Hamm, John Noble of “Fringe,” “Modern Family” and more. (Entertainment Weekly)

50 Cent is becoming a young adult novelist! He’s penning a book called “Playground,” about a 13-year-old bully who must atone for his behavior. Let’s hope some of that atonement takes place “in da club” where others can come give him a hug. (Vulture)

One Oasis brother gets married while the other is a wedding no-show, and Cameron Diaz has a treat for David Letterman (Hint: It’s hot and buttered.) after the jump.

Warner Bros. has reached a settlement with tattoo artist S. Victor Whitmill in the Mike Tyson tat/“Hangover Part II” case . The terms have not been disclosed, but one assumes this means they won’t have to alter Ed Helms’s face for the DVD release. (TMZ)

Noel Gallagher of Oasis got married over the weekend to girlfriend Sara MacDonald. Not invited: brother Liam Gallagher. Serving as best man: Russell Brand. (E! Online)

In other nuptial news, Judy Greer (who I like to think of as Kitty from “Arrested Development”) has gotten engaged to Dean Johnsen, her boyfriend of one year. (Popeater)

Cameron Diaz once again demonstrates her popcorn-feeding abilities on television. But this time, David Letterman reaps the benefits instead of boyfriend Alex Rodriguez.