When celebrity guests join Martha in the kitchen or crafts room, expect the unexpected. Laugh and learn as Martha cooks and crafts with award-winning actors, musicians, and more.

Octogenarian Betty White says you shouldn't get to her age and not know how to make pie crust. Martha agrees, and together they bake a classic pumpkin pie.

Martha answers cooking and baking questions from Jennifer Garner, one of her favorite guests. You'll never guess Martha's suggestion for baking with butter, but here's a hint: it involves cleavage.

Martha and Snoop Dogg compare their respective "posses." Then, he shares the essential Snoop vocabulary, and she shares the essential Kostyra family mashed-potato recipe.

Martha leads Jimmy Fallon on a ghoulish tour of our Halloween Show set. Jimmy squirms his way through a monster buffet filled with tricks, treats, and even live worms!

TV host Rachael Ray appears in Martha's kitchen for the first time! Martha shares her best pie-baking tips with Rachael, who is actually a novice baker.

Martha gets flirty in the kitchen with actor Antonio Banderas. They make delicious croquettes with serrano ham and Manchego cheese.

Former President Bill Clinton joins Martha for a very special Presidents Day Show. They chat about the Clinton Global Initiative and President Obama's first weeks in office.

Julie Andrews chats about a few of her real-life "favorite things." Then, she and Martha assemble a magical fairyland terrarium.

Actress Katherine Heigl joins Martha to dish on her new hair color and her love of animals. They craft handy pet ID tags and customized feeding bowls.

Stephen Colbert, clad in his festive Christmas sweater, learns to craft a mistletoe kissing ball. Clearly, he's not afraid to use it!

MSNBC host Rachel Maddow prepares savory barbecued shrimp and baked raspberry custard with Martha. Rachel can't help but get a kick out of Martha's blowtorch skills in the kitchen!

"You're not stuffing a cow; you're stuffing a turkey!" Martha says to Russell Crowe during their segment together. Important distinction.

The hilarious Amy Sedaris shows off her childhood Girl Scout sash and learns to craft "Martha" merit badges. Then, Martha tests her skills in crafting, homekeeping, and cooking.

Martha asks actress Toni Collette about her worst fashion faux pas -- and Toni reveals a fashion blunder from that very morning! They make wheat berry salad with grilled Arctic char.

Martha shares a mouthwatering mini cranberry-meringue pie recipe with actress Tina Fey. After some initial trepidation, she learns to love one of Martha's favorite tools: the kitchen torch.

Joan Rivers cracks jokes and crafts custom tea towels with Martha. Joan monograms her towels with "B.M." for Bette Midler, her good friend.

Martha shows actor Brendan Fraser how to create homemade sidewalk chalk. Brendan regales Martha with a tongue-twisting fast-patter routine while trying to master the art of simultaneously talking and crafting.

Queen Latifah impresses Martha in the crafts room while making a necklace from a recycled T-shirt. She's quite the crafter!

Actor Kelsey Grammer discusses his post-"Frasier" life as a Broadway actor. Martha shows him how to make classic croque monsieur sandwiches.

Chevy Chase cracks some jokes -- and strips off some clothing -- in the kitchen with Martha. She shows him how to make spicy lentil-walnut burgers.

Emma Thompson prepares delicious berry-topped tartlets with Martha. Never has a guest been so impressed with our studio and colorful audience!

Martha tells Jonathan Rhys Meyers how much she loves his TV show, "The Tudors" -- including the naughty bits. They make a recipe for savory arroz con pollo.

Actress Patricia Arquette discusses the psychic abilities of her character on "Medium," and Martha chats about some of her own premonitions. They craft lovely feather-printed T-shirts and stationery.

Martha bakes an apple-cognac crumb cake with Ludacris, one of her favorite rappers. It's the first time he's ever baked a cake, so Martha has plenty to teach him.

Martha shows CNBC host Jim Cramer the proper comforts to provide for an overnight guest. Jim decides to play the role of guest, donning a bathrobe and making himself quite comfortable!

Kathie Lee Gifford and Martha get silly in the crafts room while making children's party hats. Among Kathie Lee's memorable lines from the show: "Do you have any idea how hard it is to stand next to her and not look like a complete idiot?"

On a special April Fools' Day "Faux Show," Martha plays a few mischievous tricks on actor Jeff Daniels. Then, a special guest -- who even surprises Martha -- drops by the set.

Martha chats with Raquel Welch about her storied career and the secrets to her radiant, youthful glow. Raquel also explains the title of her book, "Raquel: Beyond the Cleavage."

Martha shows Lindsay Lohan how to make tasty cream puffs with vanilla gelato. Along the way, Martha gives her opinion on Lindsay's party-girl lifestyle!

Claire Danes learns how to craft a cute reverse applique pillow. She hadn't ever used a sewing machine before, so Martha gives her a lesson in sewing 101!

Martha prepares delicious salade nicoise with actress Julianne Moore. Although she's more of a take-out specialist than a master chef, Julianne does impress Martha in the kitchen -- with her cute shoes!

SNL's Seth Meyers joins Martha and designer Roberto Cavalli for a drink and some spirited conversation. Then, Martha shows Seth how to make a gorgeous glitter ball garland.

Martha compliments and critiques Heidi Klum on her latest fashion show. Then, they craft an elegant angel tree topper.

Actress Amanda Seyfried comes to the show prepared with a couple of handmade crafts to present to Martha. They make lovely leather flowers on the show while chatting about movie-set romance.

Actress Joan Cusack joins Martha in the kitchen to share cookie-dough woes and get Thanksgiving gravy tips. Martha shows Joan how to bake the cutest little chocolate sandwich cookies.

Martha introduces Diane Lane to a unique technique for cooking chicken. Diane chats about her chemistry with Richard Gere, both on screen and off.

Designer Isaac Mizrahi shares a recipe for cherry chocolate-chunk ice cream. They chat about their pets, his TV show, and, of course, fashion.

Funnyman Dan Aykroyd puts his cooking skills -- and his snazzy leather vest -- on display. He even brings a vest for Martha!

Martha gives tennis star John McEnroe a lesson in authentic Italian cooking with a twist. They prepare racchette -- noodles shaped like tennis racquets -- with asparagus and peas.

Nathan Lane jokes his way through an innuendo-laden crafting session with Martha. She shares a delightful faux-chocolate Easter bunny how-to.

Martha teaches Kelly Ripa to craft unique gourd-fashioned candles. Along the way, they trade their best Regis Philbin stories.

Martha teaches Diana Ross how to make lovely Valentine's Day cards. Each of the cards features a romantic song title from one of Diana's albums.

Actress Anne Hathaway discusses her holiday shopping strategy with Martha. Then, she learns to decorate an adorable silk scarf.

Acclaimed director Francis Ford Coppola joins Martha in the kitchen to prepare potato gnocchi with tomato sauce. Francis, a proud Italian-American, shares gnocchi tips and traditions from his childhood.

Martha and actress Andie MacDowell prepare a meal of peppery tofu with tangy dipping sauce and soba noodles. Andie discusses her vegetarian daughters and her own semivegetarianism.