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Guess Who Will Fill In for Bob Costas Tonight: (a) Jay Leno, (b) MEREDITH VIEIRA or (c) Maria Ouspenskaya Today Show

Bob Costas will sit it out again tonight, Friday, Feb. 14, 2014, with a continuing eye infection preventing him from hosting NBC's prime-time coverage of the Winter Olympics.

Tonight's Olympics guest host will be Meredith Vieira. For the past three nights, Matt Lauer has been filling in for Costas as well as doing his regular co-hosting chores on the "Today" shows.

While a number of women have anchored other dayparts of NBC Olympics' coverage, the network says tonight will mark the first night a woman has achored NBCs prime-time Olympics telecast.

On the "Today" show this morning Vieira said, "It's an honor to fill in for [Costas]. You think about the Olympics, and you think the athletes and then Bob Costas."

Meredith Vieira.jpg

Bob Costas, left, broadcasting last week with an eye infection, and
Meredith Vieira, in Sochi, who will substitute for Costas tonight.