Taylor Swift, New Girl
The music superstar guest stars on the season finale of the Fox comedy as Elaine, an important guest at Cece (Hannah Simone) and Shivrang's (Satya Bhabha) wedding. Based on this photo, it looks like she might be doing some interrupting!
Christie Brinkley, Parks and Recreation
The gorgeous supermodel will appear as the wife to office punching bag, Jerry (Jim O'Heir).
Sarah Jessica Parker, Glee
Our favorite Sex and the City gal returned to the small screen as a Vogue editor on the Fox comedy.
Carmen Electra, 90210
The former Baywatch babe took on the role of Vesta, who was described as a "cross between Dita Von Teese and a Pussycat Doll" on the CW drama.
John McCain, Parks and Recreation
Senator McCain tried to help Leslie Knope (Amy Poehler) while she had a breakdown in a coat closet in the season-five premiere of the NBC comedy.
Joe Manganiello, How I Met Your Mother
Brad is back! Marshall's (Jason Segel) former law school buddy had some dirty tricks up his sleeve in the courtroom during the Nov. 26 episode.
Joe Biden, Parks and Recreation
Leslie's number one crush, Vice President Joe Biden, made an appearance on the NBC mockumentary as Ben's (Adam Scott) engagement present to his future bride.
Gloria Estefan, Glee
Latina singing sensation drops in on TV daughter at McKinley High Scool. Time to blast Miami Sound Machine!
Katy Perry & Shannon Woodward, Raising Hope
It's the slammer for Sabrina in the March 6 ep. Lucky for her our favorite "California Gurl" runs the jail, which has to make her time in the pokey way more interesting.
Nick Harmon & Jamie Lee Curtis, NCIS
The highly acclaimed actress goes head-to-head with Agent Gibbs in the Feb. 21 episode "Psych Out." We are totally psyched about Gibbs getting a run for his money. Now which one of these two will solve the crime first? (Our money is on Curtis.)
Mike "The Situation" Sorrentino, Suburgatory
Will The Situation be under control on the Feb. 22 episode of Suburgatory? We'll be in front of our TVs, waiting to find out! And since he's playing a DJ, we wonder if he took some advice from Pauly D.
Ricky Martin, Glee
School is in and this week's lesson—Spanish! That's right, the sexy singer is now the new Spanish teacher things are getting a little spicy. ¡Ay, caramba!
Colin Hanks, Happy Endings
Tom Hanks' son must be relieved to find himself in a happy place after his creepy turn as a serial killer on Dexter. Everyone's happy after Dave (Zachary Knighton) gets a liquor license for the "Steak Me Home Tonight" truck and his signature drink has unexpected side effects. "Cocktails & Dreams" airs Wednesday, Feb. 29 on ABC.
Ashley Tisdale, Raising Hope
The High School Musical star trades in her dancing shoes for a date with Jimmy! Looks like a Valentine's Day miracle—or could it be a disaster? Tune in to Fox on Feb. 14 to find out.
Gary Busey, Two and a Half Men
Worst roommate ever? Gary Busey checks into Two and a Half Men as Alan's fellow mental hospital buddy on the Nov. 14 episode.
William Shatner, Psych
The TV legend beams up to Vancouver Santa Barbara to con his way back into daughter Juliet's (Maggie Lawson), with a little help from her boyfriend Shawn (James Roday) and Gus (Dulé Hill). Hilarity ensues.
Lucy Liu, Southland
The former Angel will walk the mean streets of Los Angeles in Southland's upcoming fourth season.
Danny Glover, Psych
The Hollywood legend lends his lethal (get it?) talents to psychic detective Shawn (James Roday) in "Dead Man's Curveball," airing Wednesday, Nov. 9 on USA.
Courteney Cox, Next Food Network Star
Worlds collide when our guilty pleasure NFNS heads to the set of one of our fave shows, Cougar Town, for a challenge, airing June 26. Wonder if Bobby Flay and Giada de Laurentiis will return the favor with cameos on the sitcom?
Khloé Kardashian Odom, Law & Order: Los Angeles
Our very own Khloé & Lamar lady guest stars on LOLA as the client of a murdered stylist who has some key info to share with investigators Alfred Molina and Casey Stoll.
Sean Combs, Hawaii Five-0
Diddy plays an undercover NYPD detective out for revenge in "Ho'opa'i" (airing April 18 on CBS), and it's up to McGarrett (Alex O'Loughlin) and Five-0 to stop him.
Snoop Dogg & Tristan Wilds, 90210
Beverly Hills is a far cry from Bon Temps, but maybe the Doggfather's cameo (in "Blue Naomi," airing Monday, Feb. 28 on the CW) will persuade True Blood's producers to cast him on his favorite show.
Nick Jonas, Mr. Sunshine
The teen heartthrob stretches his acting chops playing—wait for it—a teen heartthrob in the Feb. 16 ep ("Employee of the Year") of Matthew Perry's new ABC sitcom.
Katy Perry
Katy Perry (maybe you've heard of her?) guests on the Feb. 7 episode of How I Met Your Mother as Zoey's (Jennifer Morrison) cousin who is both a love interest for Ted (Josh Radnor) and a confidant of Barney (Neil Patrick Harris).