Letterman's Late Show scores higher ratings than O'Brien's Tonight Show

On night seven of Conan O'Brien's Tonight Show run, David Letterman's Late Show finished on top, overnight ratings showed.

Tuesday's Late Show featured Julia Roberts, who worked over the host for details on his recent wedding. The Tonight Show countered with Eddie Murphy.

It's hard to tell who should be more nervous about the Nielsen results: the studio execs behind the film Murphy was promoting; O'Brien, who only a week ago was beating Letterman by double digits; or Letterman, who beat the pants off early Leno, too, before running second to the comic for most of Leno's 17-year Tonight Show run.

According to Nielsen’s early metered market numbers, David Letterman and The Late Show had a 3.4 household rating while Conan O’Brien and The Tonight Show pulled a 2.9 HH rating. That’s Conan’s lowest performance since taking over the show, and the first time The Late Show has beaten The Tonight Show since October.

After taking over the interrogating, Julia Roberts took a side in the latest late-night talk-show battles.

Last night's Late Show started off innocuously enough, with Roberts chatting up David Letterman about his recent wedding.

"I don't know if I can look you in the eye anymore," she said at the beginning. "Last time I saw you, you were single and then I like hypnotized you in my white suit or something and you went off and married Regina!"

Indeed, the p.m. talker married longtime love Regina Lasko two days later, on March 19, 2009.

Then Roberts started asking the tough questions.

"So she's Mrs. Letterman?"

"No, she's Dave," he responded.

"You are so much funnier than other people who talk at this time of the evening," she mused.