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This Feb. 4, 2014 photo released by NBC shows Rachel Frederickson on the finale of "The Biggest Loser," in Los Angeles. Fredrickson lost nearly 60 percent of her body weight to win the latest season of “The Biggest Loser” and pocket $250,000. A day after her grand unveiling on NBC, she faced a firestorm of criticism in social media from people who said she went too far. (AP Photo/NBC, Trae Patton)

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This Feb. 4, 2014 photo released by NBC shows Rachel Frederickson on the finale of "The Biggest Loser," in Los Angeles. Fredrickson lost nearly 60 percent of her body weight to win the latest season of “The Biggest Loser” and pocket $250,000. A day after her grand unveiling on NBC, she faced a firestorm of criticism in social media from people who said she went too far. (AP Photo/NBC, Trae Patton)

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NBC via Associated PressJay Leno brings his successor, Jimmy Fallon, onto the "Tonight" show stage. Mr. Fallon, who will take the iconic late-night show from Los Angeles to New York starting Feb. 17, said Mr. Leno is the "nicest guy in the business."

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This April 26, 1995 photo released by NBC shows host Jay Leno embracing bandleader Kevin Eubanks on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Margaret Norton)

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This Oct. 12, 2012 photo released by NBC shows President Barack Obama during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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This Nov. 5, 2012 photo released by NBC shows Jay Leno, host of "The Tonight Show with Jay Leno," on the set in Burbank, Calif. During Leno’s two-decade tenure as NBC’s “Tonight” show host, the comic has cracked a total of 4,607 jokes at the expense of President Bill Clinton. The Washington-based Center for Media and Public Affairs counted and catalogued nearly 44,000 jokes Leno made about politics and public affairs during his time at “Tonight,” which ends Thursday.(AP Photo/NBC, Paul Drinkwater)

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This March 13, 2000 photo released by NBC shows Elton John, left, and host Jay Leno, center, looking on as professional football player Jason Sehorn, right, proposes to actress Angie Harmon on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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This Oct. 12, 2012 photo released by NBC shows President Barack Obama during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)

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This July 10, 1995 photo released by NBC shows actor Hugh Grant, left, during an interview with host Jay Leno on "The Tonight Show with Jay Leno," in Burbank, Calif., two weeks after Grant's highly publicized arrest for picking up a prostitute. After 22 years, Leno will host his last show on Thursday, Feb. 6, 2014. (AP Photo/NBC, Margaret Norton)

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This Jan. 30, 2014, photo provided by NBC shows Miley Cyrus, left, during an interview with host Jay Leno, on "The Tonight Show with Jay Leno." Leno, who took over the "Tonight Show" in 1992, will host his final episode on Thursday, Feb. 6, 2014. (AP Photo/NBC, Paul Drinkwater)