Best, cheesiest, most guilty pleasure "2000s-esque" band

Probably already done before, but in case it isn't, hi! :3

Basically what it says in the title xP. What are some upbeat, poppy bands/songs that, despite whatever your personal preference for music is, never fails to bring a goofy, cheesy grin across your face? 

I'm in the mood for something that has big "early 2000s" pop energy. (take my back to a simpler, happier time plz T_T)

(first post omg :D greetings all on spacehey)