MTV pays tribute to Amy Winehouse, who died Saturday at age 27, as the network re-airs her “45th at Night” concert (at 6:30 p.m.). In footage from a live 2007 U.S. performance, Winehouse sings tunes including “Rehab” and “Me & Mr. Jones,” backed by the Dap-Kings.

Lady Gaga makes an appearance as a guest judge on “So You Think You Can Dance” (Fox at 8) performance night, along with choreographer Rob Marshall, as they help judge the Top 8 contestants.

The new players on “Big Brother” (CBS at 8) make yet another attempt to gain a little bit of control in the house during the Power of Veto competition, as the veteran competitors continue to rule the game.

Chef Jamie Stachowski explains the popularity of chicken, beef and pork, and how our country came to love such foods so much on a two-hour special, “Meat America” (History at 9).

It was inevitable, and it has arrived: Wednesday night’s “E! True Hollywood Story” (E! at 10) profiles Nicole “Snooki” Polizzi, the “Jersey Shore” cast member who has famously conquered pop culture, even rising to the level of a joke in President Obama’s White House Correspondents’ Dinner speech. “THS” chronicles her rise to fame and talks to her parents, cast mates and childhood friends.

“Primetime Nightline: Celebrity Secrets” (ABC at 10) looks at the world of celebrity mothers, including Kris Jenner, the mom and manager of reality TV stars the Kardashian sisters.

Jennifer Love Hewitt returns to TV for a night and guest-stars on “Hot in Cleveland” (TV Land at 10) as Victoria’s daughter, who returns only to inform her mother that she wants to publish a tell-all book about her childhood.

“Through the Wormhole With Morgan Freeman” (Science at 10) tries to answer scientifically a question asked by many hopefuls: Could humans potentially live forever? The episode investigates various medical developments over the years, including research into controlling our DNA to help people live longer.

Fran decides to venture into online dating on “Happily Divorced” (TV Land at 10:30), but she may end up regretting her decision when she realizes she still has feelings for Elliot.

Actor Chris Tucker is a guest on “The Tonight Show With Jay Leno” (NBC at 11:35), joined by Animal Planet’s “Hillbilly Handfishin’ ” fishermen, Skipper Bivins and Trent Jackson, and musical guest Vanessa Carlton.

“Late Show With David Letterman” (CBS at 11:35) has “Late Late Show” host Craig Ferguson, actress Connie Britton and singer Anna Calvi.

— Emily Yahr