Tina Fey's Sarah Palin impersonations are winning rave reviews from her former SNL Weekend Update co-host Jimmy Fallon.

"Tina Fey is hitting home runs left and right. She is phenomenal," Fallon told Usmagazine.com at a bash for celeb chef Mario Batali's new book, Spain...A Culinary Road Trip, at the Bon Appetit Supper Club in NYC on Wednesday. "Amy Poehler's pregnant and running around - she's great."

See SNL's most outrageous political sketches of all time!

Fallon will soon head back to work, as he takes over NBC's Late Night for Conan O'Brien next March.

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