In our book, Melissa McCarthy can do no wrong. The scene-stealing star of Bridesmaids and Identity Thief has made us laugh so hard, we've actually cried, but now she's taking on a role geared toward a much younger audience than usual. The funny lady and mom-of-two — Vivian, 5, Georgette, 3 — is joining a long list of celebs who've visited Sesame Street to help introduce a new vocabulary word. Joining Elmo (and a penguin), Melissa will appear on the March 21 show to explain the word choreographer. Take a peek at the segment — we dare you not to laugh!