Michelle Obama Helps Sesame Street Mark the Big 4-0

Michelle Obama Helps Sesame Street Mark the Big 4-0
Michelle Obama on Sesame Street, with Big Bird (far right)
Richard Termine/AP

11/09/2009 AT 08:45 AM EST

Oscar the Grouch had better behave – and keep his political opinions to himself.

On Tuesday, to mark the 40th anniversary of the groundbreaking children's program Sesame Street, some very special guests pay a visit, including First Lady Michelle Obama. According to previews circulating the Net, she meets Big Bird – who observes that the two of them are tall.

Mrs. Obama also delivers a message that may not entirely sit well with Cookie Monster. Appearing with three kids and the show's fuzzy, red resident Elmo, she encourages them to plant seeds in the ground, water them and then expect them to sprout tomatoes, cucumbers, lettuce and carrots.

Also dropping by the 'hood on Tuesday's anniversary episode: Cameron Diaz, who introduces the word of the day, "habitat." Elmo helps the actress with the term – and visits a frog habitat – abetted by his goldfish, Daisy.

Now if only the first lady and Diaz could give Gonzo advice on his love life ...

Visit LIFE.com for Guest Editor Oscar the Grouch's memories of 40 years of Sesame Street.

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