(ALL TIMES ET)

8PM | ABC
The Middle – Axl texts a girl to ask her to the prom, and she accepts. The problem: His text went to the wrong girl, and his parents insist that he either take the girl who accepted, or tell her – in person – that he doesn’t want to be her date. Meanwhile, Frankie and Mike find Brick’s new one-man show entertaining … the first time they see it. Not so much after that.

8PM | FOX
American Idol – Lady Gaga serves as a mentor as the top four sing the songs of Jerry Leiber and Mike Stoller, who penned Elvis Presley hits like “Hound Dog,” “Jailhouse Rock” and “Don’t,” as well as other classics like “Kansas City,” “Yakety Yak” and “Stand By Me.” In other words, great music, but yet another not-so-contemporary theme that makes Idol seem out of touch. Meanwhile, it’s a very Gaga night in primetime (see below) …

8PM | CBS
Survivor – Andrea participates in her first Redemption Island duel, while another Survivor plots a major, and risky, move.

9PM | CBS
Criminal Minds – Tonight’s case becomes personal for Morgan (Shemar Moore) when a Florida serial killer begins burying his victims in the ocean, and Morgan’s aunt is petrified that her missing daughter may be among them.

9PM | ABC
Modern Family – Cam has the flu, but it’s Mitchell who’s just sick about the possibility that Cameron’s illness may jeopardize his chance to see Lady Gaga in concert.

9:30PM | ABC
Cougar Town – Is Grayson finally tired of Jules telling him what to do? Yup.

9:30PM | TLC
Extreme Couponing – One of tonight’s couponers shows how her coupon savings provide her with funds for travel, while another busy mom has to take her kids along on an otherwise meticulously-planned shopping trip.

10PM | NBC
Law & Order: SVU – All is not what it initially appears to be (i.e., twists ahead), when a woman finds a naked teenage boy sleeping in her bedroom, and the kid’s mom (Rita Wilson, a.k.a. Mrs. Tom Hanks) strenuously defends her son.

10PM | MTV
The Real World: Las Vegas – Nany‘s got some secrets, but Cooke doesn’t, as Heather finds out that Dustin and Cooke hooked up, and she’s none too happy about it.

10PM | COMEDY CENTRAL
South Park – The royal wedding and our neighbors to the north are the spoofees tonight, as Ike becomes obsessed aboot the impending nuptials of the prince, and princess-to-be, of Canada.

Worth flipping to during commercials:
– The two finalists are revealed on America’s Next Top Model (9PM, The CW);
– The MythBusters dudes test Hollywood sound effects (9PM, Discovery);
– Oz locks the team in the office when they fail to protect a fast food chicken chain’s secret recipe on Breaking In (9:30PM, Fox);
– Fickler asks the team to help find the missing daughter of his good friend, a judge, on Criminal Minds: Suspect Behavior (10PM, CBS);
– The chefs prepare a meal for Maroon 5 on Top Chef Masters (10PM, Bravo).

And the late-night line-up:
– Conan (11PM, TBS): Jon Hamm and Ke$ha;
– The Daily Show with Jon Stewart (11PM, Comedy Central): Albert Brooks;
– The Colbert Report (11:30PM, Comedy Central): James B. Stewart;
– The Late Show with David Letterman (11:35PM, CBS): Ray LaMontagne, Chaz Bono and Keith Olbermann;
– The Tonight Show with Jay Leno (11:35PM, NBC): Dick Van Dyke and Steve Earle;
– Lopez Tonight (Midnight, TBS): Nick Cannon and Bruno Tonioli;
– Jimmy Kimmel Live (12:05AM, ABC): Chris O’Donnell;
– Late Night with Jimmy Fallon (12:35AM, NBC): Jakob Dylan, Keith Richards and Jennifer Hudson;
– The Late Late Show with Craig Ferguson (12:37AM, CBS): Tim Meadows;
– Last Call with Carson Daly (1:35AM, NBC): Grouplove.