First it was N.W.A.'s classic 'Straight Outta Compton.' Then he flipped the lyrics to Young MC's 'Bust A Move.' Right after that, you saw him mouth the words to 'Rapper's Delight,' and then Snoop Dogg's 'Gin and Juice.'

We're talking about Brian Williams, of course, the 'NBC Nightly News' anchor. For his most recent take on hip-hop classics, he raps the lyrics to Sir Mix-a-Lot's 1992 hit 'Baby Got Back.'

Thanks to someone on 'The Tonight Show Starring Jimmy Fallon' editing team (who has an incredible amount of time of their hands), Williams proves to be a very skilled rapper. Using past footage from the 'Nightly News,' and additional footage from the 'Today' show, viewers can see Williams do a seamless rendition of the '90s cut, with the help of Kathie Lee Gifford, Savannah Guthrie and Hoda Kotb adding additional vocals.

In April, the NBC news man said the mash-up videos have taken over his life, and people talk about them everywhere he goes. "[It's] been all very big in my life... [It's like] people have discovered water. It's unbelievable, and it's all anyone mentions to me anymore," Williams said.

Watch Brian Williams Talk About His Rapping (Part 1)

Watch Brian Williams Talk About His Rapping (Part 2)