If you haven’t seen Yo Gabba Gabba yet, sorry if we just ruined the rest of your week. This stuff is insanely catchy, more than a bit weird and you’re probably going to be singing “there’s a party in my tummy” for days.

You have our apologies.

But the real blame goes on NickJr. They’ve figured out how to make kids shows that are popular on TV – but even more popular online. Here’s what Ad Age has to say about the show:

Since premiering in June, it’s become a modest hit for Nick Jr., with 4.4 million total viewers tuning to see the first five episodes, according to Nielsen. But on NickJr.com, clips of the show have been bringing “Lazy Sunday” levels of viral buzz, with 17.8 million streams on the Nick Jr. video player since June 25, according to Nielsen’s Omniture SiteCatalyst.

The online popularity of the show is not accident. It reflects the fact that Nick is giving equal attention to online viewers:

“Kids are multitasking and experiencing their entertainment on multiple platforms, so convergence is key when it comes to our programming,” says Nickelodeon’s Steve Youngwood. “It’s a natural part of our strategy to dually program big TV events.”

While the shows are for kids, they are equally designed to appeal to adults:

“What we try to do with all our shows is create a dual appeal and entertain the parents,” says Nick Chief Marketing Officer Pam Kaufman, “but there were a lot of blog entries about bands like the Aquabats or the Shins being on the show. And these are people who are single, not parents, and aware that it’s a preschool show.”

In addition to appealing to hip music bloggers to get some viral love, NickJr is appealing to the Make DIY set by offering craft projects, like this Muno pillow:

We’d like to see Nick Jr offer Yo Gabba Gabba as a video podcast, too. They’re getting kids (and our) attention on TV and online. Why not extend that onto iPods, iPhones, Zunes and other portable media players?