Celebrate Elmo’s ‘Sesame Street’ anniversary with some of the show’s biggest guests.

Ahead, classic visits toSesame Streetfrom some of the biggest celebs.

The two learned about the word explore and came upon the Golden Cabbage of Destiny.

Lupita Nyong’o, John Mayer, Zac Efron, and Christina Hendricks on ‘Sesame Street’

Sesame Street

McLean, and Kevin Richardson graced the inhabitants of Sesame Street with their presence.

Jesse Tyler Ferguson

TheModern Familyactor spent time with Cookie Monster on the Street.

The episode introduced viewers to the fact that “Elmo loves technology.”

Emily Blunt

Jesse Grant

The two discussed skin and its many shades and colors.

Zac Efron

Efron stopped by the Street to teach an important lesson.

The actor spoke to Elmo about patience the word of the day as he pestered Efron to play basketball.

Backstreet Boys

Sesame Workshop

She helped the academic teach about trees and the many benefits of plants.

John Mayer

John Mayer participated in an a segment that also featured Queen Latifah and Elmo.

The three teamed up to discuss veterans readjusting after time in the military and Mayer sang “Say.”

Destiny’s Child

Sesame Street

She met up with Abby Cadabby to explore all things fabulous.

The actress spoke Spanish to teach Elmo about fiestas.

Amy Adams

Amy Adams had a littleSesame Streetfun with Elmo.

Jesse Tyler Ferguson

Richard Termine

Kristen Bell

TheVeronica Marsalum caught up with Abby Cadabby and Elmo.

Hillary Clinton

The former FLOTUS and presidential hopeful hung out with Big Bird and Rosita onSesame Street.

Aaron and Nick Carter

The Backstreet Boy and his little brother stopped by the Street together.

Christina Hendricks

Jesse Grant

Tina Fey

Ahoy there, Liz Lemon!

Wait a minute… shouldn’t that be ‘‘illusionist’’?

The animated spoof was fittingly an exploration of the letterO.

Lauren Graham

Jesse Grant

Ben Stiller

He’s never afraid to appear cheesy, and that’s why we love him.

Stiller sang ‘‘The People in Your Neighborhood’’ with Telly.

‘‘A cheese is a really great fella, call me swiss, brie, or mozzarella.’’

Lupita Nyong’o

Jesse Grant

Now where’s the ham?

Without Y, she couldn’t spell her favorite words (likeyogurtandyarn).

‘‘Don’t know why Y didn’t come.’’

Zac Efron

Jesse Grant

‘‘Ain’t nobody care about no C,’’ he said.

But oh yes, we did, and all the letters after that.

Everybody was jumping and laughing…and then it turned sour.

Cameron Diaz

Richard Termine

‘‘Furry, sobbing monsters feeling sad.’’

You kind of have tosee it.

Did we mention he had hair?

John Mayer

Richard Termine/ Sesame Street

Lily Tomlin

Who can’t look at an oversize chair without thinking of Tomlin’s precocious character?

‘‘B or not a B, that is the question.

Whether ‘tis the second letter of the alphabet, or some other merry letter…. Now, by my sword I declare B or not a B, ‘tis B.

Kim Cattrall

Richard Termine

Good night, sweet B.’’

Denyce Graves

The soprano sings Elmo to sleep with a lullaby.

‘‘Stars are twinkling up in the sky/It’s time for you to go beddie-bye.’’

Viola Davis

Jesse Grant

Complete with castanets and bleating sheep.

Then Elmo busts out in a toreador’s outfit.

Not quite a soothing lullaby, but unforgettable nonetheless.

Amy Adams

Jesse Grant

The little red monster pipes in, too, and holds his own against the maestro.

We get a rare glimpse of the Count’s feet.

But Tito starts to play (what else?)

Celine Dion

Sesame Street

Even Oscar can’t stay in a foul mood.

The three Honkers accent his playing with various head dings and nose honks.

Yo-Yo keeps a wonderfully straight face throughout.

Kristen Bell

Jesse Grant

LL Cool J

The rapper goes with Elmo on an Addition Expedition around Sesame Street.

‘‘Add ‘em up’’ went the refrain.

Various monsters were throwing it down as LL and Elmo practiced their mad math skillz.

Hillary Clinton

Don Perdue/ AP

Candice Bergen

TheMurphy Brownstar gets the tables turned on her when Elmo plays the interviewer.

Does it breathe, does it grow?

Will it eat a banana or peanuts or a burger?

Aaron and Nick Carter

Sesame Street

Williams puts his loafer to the test: the shoe is definitely not alive but makes a fine nutcracker.

Marlee Matlin and Billy Joel

The two serenade Oscar with ‘‘Just the Way You Are.’’

‘‘Just be grouchy/You’ve done it pretty well so far.’’

Julie Andrews

Sesame Street

Jake Gyllenhaal

Jesse Grant

Tina Fey, Sesame Street | TINA FEY Ahoy there, Liz Lemon! The 30 Rock star made a big impression as a singing, thieving ‘‘bookaneer,’’ one of the pirates of the

Sesame Workshop

WILL ARNETT Sesame Street and the late Arrested Development are designed for vastly different audiences — but the two worlds collided when Arrested star Arnett

Sesame Workshop

STEVIE WONDER The show was just four years old when a 20-something Wonder stopped by to serenade kids — as well as enthralled parents —

Sesame Workshop

Sesame Street, Oprah Winfrey | OPRAH Oprah made the Sesame Street producers’ dreams come true by voicing an Oprah-esque character in a parody of The Oprah Winfrey Show for the

Courtesy Sesame Workshop

Sesame Street, Michelle Obama | MICHELLE OBAMA The First Lady helped celebrate Sesame Street ’s 40th birthday with a visit to extol the virtues of fresh fruits and vegetables. She

Feist, Sesame Street | FEIST The indie chanteuse kicked off the show’s 39th season with a monsterrific version of her ubiquitous counting song, ‘‘1-2-3-4.’’ WATCH IT!

James Earl Jones, Sesame Street | JAMES EARL JONES His skit lasted only seconds, but remember that old adage about how a good actor can make the phone book riveting? Jones,

Ben Stiller, Sesame Street | BEN STILLER He’s never afraid to appear cheesy, and that’s why we love him. Stiller sang ‘‘The People in Your Neighborhood’’ with Telly. He met

Johnny Cash, Sesame Street | JOHNNY CASH The Man in Black (okay, he still wore blue denim then) faced off against the monster in green (Oscar at his grumpiest) with

Norah Jones, Sesame Street | NORAH JONES Jones gets stood up by the letter of the day, so she sang ‘‘Don’t Know Y’’ to Elmo at the piano. Without Y,

Richard Pryor, Sesame Street | RICHARD PRYOR Pryor gains a spot on our list merely for his ability to keep us on the edge of our seats, for he didn’t

R.E.M., Sesame Street | R.E.M. In a joyful jam with the Muppets, the group sang ‘‘Furry Happy Monsters’’ (to the tune of ‘‘Shiny Happy People,’’ natch) with great abandon.

Jesse Jackson, Sesame Street | JESSE JACKSON Talking to a group of kids on the Street, Jackson gave an early lesson in self-confidence and tolerance, encouraging the tykes to accept

Aaron Neville, Sesame Street | AARON NEVILLE The big guy sweetly sang — as if there were any other way — ‘‘I Don’t Want to Live on the Moon’’ with

Richie Havens, Sesame Street | RICHIE HAVENS This is one of those low-key musical performances the show did before deciding to add bouncing Muppets to every number, and the simplicity

Paul Simon, Sesame Street | PAUL SIMON Yup, Simon — rocking a pageboy haircut — was just hanging on the stoop, singing ‘‘Me and Julio Down by the Schoolyard,’’ and

Lily Tomlin, Sesame Street | LILY TOMLIN Who can’t look at an oversize chair without thinking of Tomlin’s precocious character? ‘‘My name is Edith Ann and I can count to

Patrick Stewart, Sesame Street | PATRICK STEWART Shakespeare comes to the Street: Stage lights go up on Stewart, garbed in dark cloak, holding a chunky letter B, and there was

Sesame Street | DENYCE GRAVES The soprano sings Elmo to sleep with a lullaby. Set to Bizet’s Carmen . ‘‘Stars are twinkling up in the sky/It’s time for

Andrea Bocelli, Sesame Street | ANDREA BOCELLI The blind tenor tries his hand at getting Elmo to sleep, to the tune of ‘‘Time to Say Goodbye,’’ with much more soothing

James Blunt, Sesame Street | JAMES BLUNT Without a hint of irony, Blunt sings, to the melody of ‘‘Beautiful,’’ this song to Telly: ‘‘This shape was brilliant/This shape was pure/I

Harry Belafonte, Sesame Street | HARRY BELAFONTE Belafonte, sitting under a palm tree, sings a calypso-tinged ditty about a coconut-counting man, with two cute birdies as backup singers. We get

Tito Puente, Sesame Street | TITO PUENTE The king of the timbales squares off against Oscar the Grouch, who wants quiet for a meeting of fellow monsters. But Tito starts

Yo-Yo Ma, Sesame Street | YO-YO MA In white tie and tails, the classical cellist joins the Honkers, performing a piece by Murray Beethoven, the famous Honker. The three Honkers

Little Richard, Sesame Street | LITTLE RICHARD Sitting in a bathtub, Little Richard plays a funky ode to rubber duckie on the piano, with backup from a sax-playing monster. WATCH

LL Cool J, Sesame Street | LL COOL J The rapper goes with Elmo on an Addition Expedition around Sesame Street. ‘‘Add ‘em up’’ went the refrain. Various monsters were throwing

Candice Bergen, Sesame Street | CANDICE BERGEN The Murphy Brown star gets the tables turned on her when Elmo plays the interviewer. See Bergen make a sad face and find

Robin Williams, Sesame Street | ROBIN WILLIAMS The funnyman, amazingly subdued here, talks about what things are alive, and how to tell if they are. Does it breathe, does it

Billy Joel, Marlee Matlin, … | BILLY JOEL AND MARLEE MATLIN The two serenade Oscar with ‘‘Just the Way You Are.’’ ‘‘Just be grouchy/You’ve done it pretty well so far.’’ With

Patti LaBelle, Sesame Street | PATTI LaBELLE The singer, backed up by Sesame Street characters, belts out the alphabet, gospel-style, with a rousing finish. WATCH IT!