Rovio Mobile is celebrating the second “birthday" of Angry Birds [$.99 / Lite / HD / HD Lite] in style. Of course, the app has been updated with new levels — specifically, 15 birthday-themed levels, complete with cake and candles and hats. But Rovio is also taking the celebration to the streets. Starting at 11AM, Barnes & Noble stores around the country are holding exclusive events complete with prize raffles and Mighty Eagle scavenger hunts.

As we revealed on Twitter, Barnes & Nobles at The Grove in Los Angeles is probably going to be the best place to see this party in action. Rovio’s North American GM will be there, and he’ll apparently be carrying tons of swag with him. If you’re going to go, send us some pictures. We’d love to see that “Birds & Noble" sign in particular.

Love it or hate it, Angry Birds is huge. And it’s huge enough to score a re-branding partnership with a popular retailer for a good chunk of a Sunday afternoon. While it seems silly, this kind of thing does wonders for our favorite phone and tablet hobby, so here’s to hoping the momentum continues.

[Via VentureBeat]