Assuming you have family near by and given that the kids are so young, you could probably use a "night off".
So, here is my suggestion:
Get family (mom, dad, hers or yours) to watch the babies for a night. First check that that's okay with your wife, and plan the evening. Tell her you "think you need a night for the two of you." If she agrees, make it a stay at home night, and make it special. You can do the following: Take the afternoon off; send her to a spa; clean the house (you do this), pick up roses; have candles lit; make a romantic dinner with wine (she may have to pump and dump...but I am assuming things here.).
At the end of that GREAT night, time it so that the in-laws, or your folks, or whomever are watching the babies return them. When they come in, your wife will think the special night is all over, but instead, tell her:
"This night has been great, and it's been fun to have it just you and me for the past few hours. But it feels so right to have us all here now, again. You three are the best things in my life..., and speaking of THREE..."
Then hand her the gift-wrapped earrings.
That's what I would do.
TJR