Letterman, O'Brien, Leno Tone down Palin pregnancy jokes

Conan O'Brien says the Republican convention theme of the night is, "Who forgot to check if the vice president's daughter is pregnant?"

Late night host David Letterman said the crisis is over.

"Here's good news, ladies and gentlemen," CBS' "Late Show" host David Letterman said as his fifth and last joke. "The Palin family crisis that we were talking about on Sunday and Monday, that has been solved now and, today, the baby is being adopted by Angelina Jolie."

"I don't think that a young lady getting pregnant should even be news," said Craig Ferguson of CBS' "Late Late Show." "Unless John Edwards is the father - then that is kinda news."

NBC's Jay Leno says, "And you thought John Edwards was in trouble before! Now he has really done it."

Meanwhile, in an interview with Rolling Stone, Letterman expressed shock over NBC's decision, announced four years ago, to replace Leno next year with Conan O'Brien, the current host of "Late Night."

"Unless I'm misunderstanding something, I don't know why, after the job Jay has done for them, why they would relinquish that," Letterman said in the interview. "I guess they thought it was a less messy way to handle what happened to me at NBC. I don't know."

Letterman was moved from NBC to CBS in 1993 after Leno replaced Johnny Carson on NBC's "Tonight" show, which created one of the most apparent rivalries on late-night television.