They grow so fast!

Neil Patrick Harris and husband David Burtka shared some brand new photos of their twins, Gideon and Harper, on Sunday as the adorable kids celebrated their fourth birthday.

"Happy 4th birthday, Gideon and Harper. I can't believer that you used to be tiny baby things. And now, this," NPH captioned the photo above. 

In the pic, the two look happier than every while unwrapping a few gifts. Harper's wearing a Wonder Woman costume while Gideon sports a "Sister for Sale" t-shirt.

The actor posted another photo this morning, showing the two proudly displaying one of their birthday presents (below).

"One of the kids' birthday presents was a magic set! GAH! Like father, like twins," Neil captioned the pic. NPH is President of the Board of Directors of Hollywood's Magic Castle, so it sounds like he'll be giving these two some lessons soon enough!


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