If you both see these cats in diapers and their dialogue, you'll likely see this as a late April Fools joke (although Easter is just on April 4), because I'm frankly not comfortable about putting adult characters in diapers, yet I want to do something new for once.

Nathan and Nathaniel Catsofast appear in the broken, open Easter egg, wearing nothing but diapers.

Nathaniel: You've got to be kidding me, Diego! He said we would give Rosemary an Easter surprise, but this is not what I expected today!
Nathan: You mad bro? Clearly, you decided to help me impress my girlfriend.
Nathaniel: But that's because that dingo guilt-tripped me into doing this! And I thought we were wearing bunny pants!
Nathan: About that, Dig wanted a secret between me and him. Tim placed diapers into detachable-by-remote bunny pants.
Nathaniel: You're into this too, Timothy?!

Diego: Hahaha! Look at that serious cat! I told you you could get him good, bro!
Timothy: Hehe! Yeah, I'm still uncomfortable seeing those twins in diapers, yet I can't help myself laughing! Hahaha!
Rosemary: Man, you two troublemakers sure get along in trolling people, because that's one of the best gifts Nathan has ever made for me! Haha! Good one big bro!
Timothy: Hahaha, oh sis! Troublemaking, haha (then angrily) no!