Katie Couric Katie Couric

Prime time better watch its back: Not only will Jay Leno soon snag the 10 pm hour on NBC, but Katie Couric will borrow an 8 pm slot Wednesday for a special broadcast of The CBS Evening News.

The show isn't leaving its normal 6:30 pm position. But network executives hope Couric's raid on prime time will showcase her strengths and help her snag more viewers earlier in the evening. CBS' network news has consistently placed third in the ratings for more than a decade before Couric arrived at the network in September 2006, but its successful prime-time programming makes it the most-watched network.

The one-night experiment seems to be a first, Sean McManus, the president of CBS News and Sports, told The New York Times. He believes no broadcast network has aired an updated version of its dinner-hour network newscast in prime time.

And though her show will stay in place, Couric will make another foray into prime time at 9 pm on Feb. 4. Katie Couric: 'All Access' Grammy Special will feature the newscaster interviewing Justin Timberlake, Lil Wayne, Katy Perry and Taylor Swift.

She may be getting into sports reporting too: She goes golfing with Timberlake and bowls with Lil Wayne.