This week a new season of Sesame Street premiered on PBS. While this news is of particular interest to readers with small children, the rest of us have some reason to care, too: The show’s 39th season welcomes fun guest stars, including Neil Patrick Harris (on today’s show), Arrested Development’s Will Arnett (Aug. 18), Feist (that’s on YouTube), LL Cool J (Sept. 22) and many more.

Future eps will include appearances by Jonah Hill, Sandra Oh, Molly Shannon, Jessica Alba and others. They’re even planning spoof segments called “Pre-School Musical” and “30 Rocks,” which I hope will look as good as it sounds.

Check out the show’s new website for more Sesame goodness. Celebrity moms Heidi Klum and Jenny McCarthy round out this week’s guest appearances.