To help celebrate 50 years of the children's television show, the 16 stamps will feature all your favorites from the show, including Big Bird, Bert & Ernie, Elmo, Cookie Monster and Oscar the Grouch.

The Postal Service honors Sesame Street as one of the most influential and beloved children’s television shows. For the last 50 years, it has provided educational programming and entertainment for generations of children throughout the country and around the world. The stamp art features photographs of 16 Muppets from Sesame Street:
•    Big Bird
•    Ernie
•    Bert
•    Cookie Monster
•    Rosita
•    The Coun
•    Oscar the Grouch
•    Abby Cadabby
•    Herry Monster
•    Julia
•    Guy Smil
•    Snuffleupagus
•    Elmo
•    Telly
•    Grover
•    Zoe

Abby Cadabby is a fairy-in-training who lives on Sesame Street. She made her debut in 2006, in the first episode of Sesame Street’s 37th season, when she moved into the neighborhood and met some of the Street's residents. After counting to ten with the Count, Abby's magic wand sets off too much lightning and breaks, so Big Bird takes her to the Fix-It Shop so her wand can be repaired.

Her name is a play on the magic word "abracadabra." Abby's magical abilities include popping in and out of thin air, floating when she's happy, and turning things into pumpkins. Although familiar with the world of fairy tales, Abby is astounded by such basic learning skills as drawing letters or counting, prompting her catchphrase "That's so magic(al)!" She frequently uses her wand cell phone to call her mommy. When she's asked to return home, she says that she's "gotta poof" or "disappear." In recent years, she has used the phrase "Zippity-zap!" when casting a spell.

She can speak a language called "Dragonfly" and is teaching Rosita the language while Rosita teaches her Spanish. She also claims to speak "Butterfly" and "Puppydog." Along with Baby Bear, Abby begins attending school in Episode 4110 at the Storybook Community School, where Mrs. Goose is the teacher and other fairy tale characters like Hansel and Gretel are her classmates.

Abby's parents are divorced and she spends part of her time living with her mommy and part of it living with her daddy. By Season 47, Abby's mom got remarried to a monster named Freddy, and Abby also gained a new stepbrother, Rudy, who has a habit of borrowing her wand without asking.

Tony Geiss conceptualized Abby as a way simultaneously to introduce a major female character to the show and add someone from a different culture, without "having consciously to introduce somebody from Indonesia or India." Abby's design is an intentional departure from the typical Muppet look because she's not originally from Sesame Street. The implication is that the fairies in her old neighborhood look like her. Carrara's audition with Abby was a 15-minute long improv with Fran Brill as Zoe, about fairy castles.

Abby has starred in her own animated segments on the show; Abby's Flying Fairy School, which debuted in Season 40, and Abby's Amazing Adventures, premiering in Season 49. Abby's likeness has been adapted for a 43-foot balloon which premiered in the 2007 Macy's Thanksgiving Day Parade, a full-body costume character for stage appearances, and a number of merchandise items.

In 2008, Abby was added to the cast of Plaza Sésamo, the Mexican co-production of Sesame Street, appearing in new segments where she tries to perform magic tricks with various ordinary objects. In 2009, she became the host of 3, 2, 1 Vamos!, a Latin American pre-school programming block, which first aired in English in 2010, on Canadian television.

By Season 46, Abby developed an interest in gardening and maintains a fairy garden where she grows magical plants. The garden features prominently in Episode 4611, in which she and Elmo are coaxed by her kooky friend Jerome the Garden Gnome into playing some games.