Sideshow: The weightiest of matters

In a radical, heretofore inconceivable life lesson, Kelly Osbourne tells Cosmopolitan Body mag that her recent 60-pound weight loss has made her look good but did not necessarily make her happy. "People think I lost weight and that's what made me happier. That's not true: I had to learn to love myself first," says Kelly, 28, who also is happy to be with beau Matthew Mosshart.

"That was one of the scariest times of my life," Kelly says. "I swear I've never felt more naked, because I had to actually be me and couldn't mask it."

Katie Holmes plugged her Broadway play, Dead Accounts, on the Late Show With David Letterman, Thursday night by admitting she forgot her lines during a performance.

"A couple of weeks ago I had the moment that I've been dreading," the radiant ray of radiance told David Letterman. "Which was, I have this kind of big speech in the second act and it's pretty important because it kind of goes along with the theme of the show. And I said the first line, and I'm looking at [costar] Judy Greer and I'm supposed to be angry with her. And then the second line I didn't remember. And I didn't remember the third one." She recovered. All was well with the world again.

Jake Tapper, 43, Philly-raised ABC newsman whose dad is an associate clinical professor of pediatrics at Jefferson Medical College, is hopping over to CNN to become its chief Washington correspondent. He'll also host a one-hour weekday news program in the 7 to 10 p.m. slot. . . .    Rebel Wilson, MTV says, will host the MTV Movie Awards on April 14. . . . Rock rag Spin has killed its print edition after 25 years. Its website will keep on keeping on at www.spin.com/. . . . South Korean hip-hop sensation Psy's "Gangnam Style" vid has reached 1 billion views on YouTube.

The Killers' show at Susquehanna Bank Center in Camden originally set for Dec. 13 is now set for May 19. All tix for the original show will be honored.